SC US (TTGP), LTD. bought LIFE

Footnotes

Upon the closing of the Issuer's IPO, all shares of Series A-2, Series A, Series B, Series C, and Series D Preferred Stock automatically converted into shares of Class A Common Stock of the Issuer (the "Class A Conversion") based on the IPO price of the Class A Common Stock. Immediately following the Class A Conversion, shares of the Class A Common Stock included in this Form 4 exchanged at a 1:1 ratio for shares of Class B Common Stock. Each share of Class B Common Stock is convertible at the option of the holder thereof into one share of Class A Common Stock and otherwise in accordance with the terms of the Issuer's Certificate of Incorporation. The securities have no expiration date.; SC US (TTGP), Ltd. is (i) the general partner of SC U.S. Growth VIII Management, L.P., which is the general partner of Sequoia Capital U.S. Growth Fund VIII, L.P. (GFVIII), and (ii) the general partner of SC U.S. Venture XV Management, L.P., which is the general partner of Sequoia Capital U.S. Venture Fund XV, L.P., Sequoia Capital U.S. Venture Partners Fund XV (Q), L.P., Sequoia Capital U.S. Venture Partners Fund XV, L.P., and Sequoia Capital U.S. Venture XV Principals Fund, L.P. (collectively, the XV Funds).; [continued from Footnote 2] As a result, SC US (TTGP), Ltd. may be deemed to share voting and dispositive power with respect to the shares held by GFVIII and the XV Funds. Each of SC US (TTGP), Ltd., SC U.S. Growth VIII Management, L.P. and SC U.S. Venture XV Management, L.P. disclaims beneficial ownership of the shares held by GFVIII and the XV Funds, as applicable, except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.