POWER OF ATTORNEY

        The undersigned hereby constitutes and appoints each of Kathleen
Okolita and Stephanie O'Brien, signing singly and acting individually, and each
with full power of substitution, the undersigned's true and lawful attorney-in-
fact to:

        (1)    execute for and on behalf of the undersigned, in the
undersigned's capacity as an authorized signatory and/or director of any of the
entities listed on Exhibit A (each, a "Morningside Entity"), from time to time
with respect to the following U.S. Securities and Exchange Commission ("SEC")
forms related to the Morningside Entities and their shareholdings in any of the
companies (each, a "Company") listed on Schedule 1 hereto: (i) Form ID,
including any attached documents, to effect the assignment of codes to the
undersigned to be used in the transmission of information to the SEC using the
EDGAR System; (ii) Form 3, Initial Statement of Beneficial Ownership of
Securities, including any attached documents; (iii) Form 4, Statement of
Changes in Beneficial Ownership of Securities, including any attached
documents; (iv) Form 5, Annual Statement of Beneficial Ownership of Securities
in accordance with Section 16(a) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), and the rules thereunder, including any attached
documents; (v) Schedule 13D; (vi) Schedule 13G; and (vii) amendments of each
thereof, in accordance with the Exchange Act and the rules thereunder,
including any attached documents;

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

        (3)    seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information regarding transactions in the Company's
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such
person to release any such information to such attorney-in-fact and approves
and ratifies any such release of information; and

        (4)    take any other action of any type whatsoever in connection with
the foregoing which, in the opinion of 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 such attorney-in-fact on behalf of
the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact may approve in
such attorney-in-fact's discretion.

        The undersigned hereby grants to each such attorney-in-fact, acting
singly, full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary or proper to be done in the exercise of any of
the rights and powers herein granted, as fully to all intents and purposes as
the undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming nor relieving, nor are any of the Morningside
Entities or any Company assuming nor relieving, any of the undersigned's
responsibilities to comply with Section 16 or Regulation 13D-G of the Exchange
Act. The undersigned hereby acknowledges that none of the Morningside Entities,
any Company nor the foregoing attorneys-in-fact assume (i) any liability for
the undersigned's responsibility to comply with the requirement of the Exchange
Act, (ii) any liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability of the undersigned for
profit disgorgement under Section 16(b) of the Exchange Act and further agrees
to indemnify each attorney-in-fact from and against any demand, damage, loss,
cost or expense arising from any false or misleading information provided by
the undersigned to such attorney-in-fact.

        This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file such forms with respect to the
undersigned's or any Morningside Entity's holdings of and transactions in
securities issued by the Companies, unless earlier revoked by the undersigned
in a signed writing delivered to the foregoing attorneys-in-fact.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of March 2nd, 2023.

                                   /s/ Frances Anne Elizabeth Richard
                                   ----------------------------------
                                   Frances Anne Elizabeth Richard


                               Exhibit A

        [List all the Morngingside entities of which the undersigned is a
signatory and/or director]


                                Schedule 1

        1.  17 Education & Technology Group Inc.

        2.  Apellis Pharmaceuticals, Inc.

        3.  Amylyx Pharmaceuticals, Inc.

        4.  ASLAN Pharmaceuticals Limited

        5.  Chimerix, Inc.

        6.  Chinook Therapeutics, Inc.

        7.  Gorilla Technology Group Inc.

        8.  Gracell Biotechnologies Inc.

        9.  GreenLight Biosciences Holdings, PBC

        10. Hepion Pharmaceuticals, Inc.

        11. Kala Pharmaceuticals, Inc.

        12. Kezar Life Sciences, Inc.

        13. LumiraDx Limited

        14. NewAmsterdam Pharma Company N.V.

        15. Rockley Photonics Holdings Limited

        16. Xometry, Inc.