POWERS OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears

below hereby constitutes and appoints Mark McDonnell his or its true and

lawful attorney-in-fact, with full power of substitution, to sign any and

all instruments, certificates and documents that may be necessary, desirable

or appropriate to be executed on behalf of himself as an individual or in

his capacity as a direct or indirect general partner, member, director,

officer or manager of any partnership, corporation or limited liability

company, pursuant to section 13 or 16 of the Securities Exchange Act of 1934,

as amended (the "Exchange Act"), and any and all regulations promulgated

thereunder, and to file the same, with all exhibits thereto, and any other

documents in connection therewith, with the Securities and Exchange Commission,

and with any other entity when and if such is mandated by the Exchange Act or

by the Financial Industry Regulatory Authority, granting unto said

attorney-in-fact full power and authority to do and perform each and every

act and thing necessary, desirable or appropriate, fully to all intents and

purposes as he might or could do in person, thereby ratifying and confirming

all that said attorney-in-fact, or his substitutes, may lawfully do or cause

to be done by virtue hereof.  This Power of Attorney shall remain in full force

and effect with respect to each undersigned person unless and until six months

after such person is both no longer a Managing Director of ARCH Venture Partners

and no longer serving on the board of directors of any portfolio company of any

ARCH Venture Partners fund.



IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 21th day

of February, 2019.



ARCH VENTURE FUND X, L.P.



By: ARCH Venture Partners X, L.P.

its General Partner

By: ARCH Venture Partners X, LLC

its General Partner

By: /s/ Keith Crandell

Managing Director



ARCH VENTURE PARTNERS X, L.P.



By: ARCH Venture Partners X, LLC

its General Partner

By: /s/ Keith Crandell

Managing Director



ARCH VENTURE FUND X OVERAGE, L.P.



By: ARCH Venture Partners X Overage, L.P.

its General Partner

By: ARCH Venture Partners X, LLC

its General Partner

By: /s/ Keith Crandell

Managing Director



ARCH VENTURE PARTNERS X OVERAGE, L.P.



By: ARCH Venture Partners X, LLC

its General Partner

By: /s/ Keith Crandell

Managing Director



ARCH VENTURE PARTNERS X, LLC



By: /s/Keith Crandell

Managing Director



/s/ Keith Crandell

Keith Crandell



/s/ Kristina Burow

Kristina Burow



/s/ Robert Nelsen

Robert Nelsen



/s/ Steven Gillis

Steven Gillis