Exhibit 24.1

POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints David Pezeshki his 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,
director, officer, member 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.
IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of
February, 2017.


/s/ Robert Adelman
Robert Adelman

/s/ Corey Goodman
Corey Goodman