LIMITED POWER OF ATTORNEY

       The undersigned hereby constitutes and appoints John Evans, Terry-Ann
Burrell, and Jon Mahlowitz, and each of them individually, with full power of
substitution, as the undersigned's true and lawful attorney-in-fact to:

       (1)   prepare, execute in the undersigned's name and on the undersigned's
             behalf, and submit to the U.S. Securities and Exchange Commission
             (the "SEC") a Form ID, including amendments thereto, and any other
             documents necessary or appropriate to obtain codes and passwords
             enabling the undersigned to make electronic filings with the SEC
             of reports required by Section 16(a) of the Securities Exchange Act
             of 1934, as amended, or any rule or regulation of the SEC;

       (2)   execute for and on behalf of the undersigned, in the undersigned's
             capacity as officer and/or director of Beam Therapeutics Inc. (the
             "Company"), Forms 3, 4, 5 and any Schedules 13D or 13G in
             accordance with Section 16(a) of the Securities Exchange Act of
             1934, as amended, and the rules thereunder;

       (3)   do and perform any and all acts for and on behalf of the
             undersigned that may be necessary or desirable to complete and
             execute any such Form 3, 4, or 5 or Schedule 13D or 13G, complete
             and execute any amendment or amendments thereto, and timely file
             such form with the SEC and any stock exchange or similar authority;
             and

       (4)   take any other action of any type whatsoever in connection with the
             foregoing that, in the opinion of each such attorney-in-fact, may
             be of benefit to, in the best interest of, or legally required by,
             the undersigned, it being understood that the documents executed
             by each such attorney-in-fact on behalf of t undersigned pursuant
             to this Power of Attorney shall be in such form and shall contain
             such tms and conditions as each such attorney-in-fact may approve
             in each such attorney-in-fact's discretion.

       The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsecessary, or
proper to be donen the exercise of any of the rights and powers herein granted,
as fullyallntents an purposes  the undersigned might or could do if personally
present, with full poweofubitution or vocation, hereby ratiing and confirming
all that each such attorney-in-fact, or each such aney--facs substitute or
substitute shall lawfully do or cause to be done by virtue of this power of
atrneanthe rits and powers herein ted. The undersigned acknowledges that each
foregoing attorney-inact, inerng i such cacity at request of thendersigned, are
not assuming, nor is the Compa assungany  the
ndersigned respoibities to comply
wh Section 16 of the Securities Exchange o1934as ameed.

     This Pow of Attorn shall remain in fullorce and effect until the
undersigned is no longer required to file Forms 3, 4, 5, and any Schedules 13D
or 13G with respect to the undersigned's holdings of and transactions in
securities issued by the Company, unless earlier revoked by the undersigned in a
signed writing delivered to each foregoing attorney-in-fact.

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       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 22nd day of March, 2023



                                          /s/ Christine Bellon
                                          ----------------------
                                          Name: Christine Bellon


















































Signature Page to Limited Power of Attorney