February 13, 2019

Yossi Maimon
Chief Financial Officer
Protalix BioTherapeutics, Inc.
2 Snunit Street
Science Park
POB 455
Carmiel, Israel 20100

       Re: Protalix BioTherapeutics, Inc.
           Form 10-K for the Fiscal Year Ended December 31, 2017
           Filed March 6, 2018
           Form 10-Q for the Quarterly Period Ended September 30, 2018
           Filed November 7, 2018
           File No. 001-33357

Dear Mr. Maimon:

       We have reviewed your December 27, 2018 response to our comment letter
and have the
following comments. In some of our comments, we may ask you to provide us with
information
so we may better understand your disclosure.

       Please respond to these comments within ten business days by providing
the requested
information or advise us as soon as possible when you will respond. If you do
not believe our
comments apply to your facts and circumstances, please tell us why in your
response.

     After reviewing your response to these comments, we may have additional
comments. Unless we note otherwise, our references to prior comments are to
comments in our
December 4, 2018 letter.

Form 10-Q for the Quarterly Period Ended September 30, 2018

Notes to the Consolidated Financial Statements
d. Revenue Recognition, page 8

1.     We acknowledge your response to comment one. Please address the
following as it relates
       to your determination that the performance obligations represented a
single performance
       obligation since the license, clinical development and manufacturing and
supply
       obligations were not distinct:
 Yossi Maimon
FirstName LastNameYossi Maimon
Protalix BioTherapeutics, Inc.
Comapany NameProtalix BioTherapeutics, Inc.
February 13, 2019
Page 2
February 13, 2019 Page 2
FirstName LastName
             how your statement on page 2 of your response that Chiesi was not
granted any other
             rights to, or benefits from, the intellectual property is
consistent with Section 2.1b of
             the agreements. The agreements appear to give Chiesi the right to
use Protalix
             Technology as necessary to (i) seek and obtain Regulatory Approval
for the Licensed
             Product in the Field in the Territory.
             why the license and research and development services, either
alone or combined, are
             not capable of being distinct from the manufacturing services
pursuant to ASC 606-
             10-25-19a. In this respect, the subcontracting and sublicensing
rights in Section 2.4
             and step-in rights in Section 3.2 of the agreements appear to
indicate there may be
             available resources outside of the company that could provide the
research and
             development services and supplies. Refer also to Example 56, Case
B in ASC 606-10-
             55-371 through 55-372. In this regard, we note in Case A that an
approved drug is
             provided in the contract with manufacturing services, for which no
other promised
             goods or services are included in the contract, which appears to
be contrary to the
             company's facts and circumstances.
             why the license and research and development services, either
alone or combined, are
             not separately identifiable from the supply obligation and thus do
not meet the criteria
             in ASC 606-10-25-19b. In this regard, it appears due to the
subcontracting and
             sublicensing rights, the license and research and development
services are not inter-
             related with the manufacturing services pursuant to ASC
606-10-25-21c. Refer also to
             Example 56, Case B, ASC 606-10-55-372A.
2.       As it relates to your determination that revenue from the combined
performance
         obligation should be recognized at a point in time upon the supply of
the drug, please
         address the following:

             Your response states that you intend to recognize revenue at the
point in time in which
             Chiesi achieves control over batches supplied. However, you also
state that you will
             recognize revenue as product is delivered to Chiesi based on the
quantity supplied
             compared to the forecasted quantity of the drug to be supplied
over the term of the
             agreements, which would appear to be an over time measurement.
Please clarify this
             apparent inconsistency. Please also explain how you intend to
estimate the forecasted
             quantity of the drug to be supplied over the term of the
agreements and how this
             estimate would be deemed to be a reasonable measure of progress
considering the
             guidance in ASC 606-10-25-36.
             Your response states that Protalix will "start satisfying its
performance obligation only
             upon supply of the drug after issuance of regulatory marketing
approvals." Explain
             how you considered the contract duration guidance in ASC
606-10-25-3 which states
             that the guidance in this Topic should be applied to the duration
of the contract (that is,
             the contractual period) in which the parties to the contract have
present enforceable
             rights and obligations. In this regard, it would appear that the
enforceable rights and
             obligations under these contracts began at their effective dates,
which was October 19,
 Yossi Maimon
Protalix BioTherapeutics, Inc.
February 13, 2019
Page 3
             2017 for the Chiesi Ex-U.S. Agreement and July 23, 2018 for the
Chiesi U.S.
             Agreement. Accordingly, it is unclear to us why an over time
measurement of your
             performance obligation would not be recognized over the entire
contractual period.
             Explain how you considered the guidance in ASC 606-10-25-27(c) in
determining
             whether your performance obligation is being satisfied over time.
In this regard,
             address the following:
             o  Clarify whether your performance under the contracts create an
asset with
                alternative future use. In this regard, explain whether you are
contractually
                restricted from developing pegunigalsidase alfa (PX-102) for
your or any other
                entity's benefit as long as the Chiesi agreements are in
effect.
             o  Explain whether you have an enforceable right to payment for
performance
                completed to date under the contracts. In this regard, it would
appear that you
                would have the full right to the non-refundable upfront
payments (at a minimum)
                even in the event that the drug does not receive regulatory
approval and enter the
                commercialization phase.

       You may contact Mary Mast at (202) 551-3613 or Angela Connell at (202)
551-3426
with any other questions.



FirstName LastNameYossi Maimon                                Sincerely,
Comapany NameProtalix BioTherapeutics, Inc.
                                                              Division of
Corporation Finance
February 13, 2019 Page 3                                      Office of
Healthcare & Insurance
FirstName LastName