Yes its the mark ! ... well atleast it appears to be the forerunner to it. I downloaded the PDF and read thru the Mederna patent , its called Luc-mmRNA1273 ( Luciferin modified messenger Ribonucleic Acid ) and yes they used human embryonic ( fetal ) kidney epithelial cells in its development. US patent #10,703,789 B2 (pdf) skip the introduction , scroll down to pages 193 ( sections 347, 348, 349), pages 200-206 ( sections )363,369,375,383,386,397,399. Check also tables 110 to 115 and table 121. Its free for download and in the public domain.
Also you might be interested in looking up CRISPR-CAS9 for which three biologists just recently (2020) received the Nobel prize in medicine, a revolutionary RNA/DNA gene splicing technology.
Yes folks we are truely living in the last of the last days.