gmo yeast is the core, mycoplasma shell.

CRAIG VENTER: “We are here today to announce the first synthetic cell -- a cell made by starting with the digital code in the computer, building the chromosome from four bottles of chemicals, assembling that chromosome in yeast, transplanting it into a recipient bacterial cell and transforming that cell into a new bacterial species.”

SYNTHIA: PLAYING GOD IN A SANDBOX

https://microbiologysociety.org/publication/past-issues/what-is-life/article/synthia-playing-god-in-a-sandbox-what-is-life.html

'Synthia' Brings New Life to Science of Genetic Engineering

https://learningenglish.voanews.com/a/scientists-produce-first-cell-controlled-by-man-made-genome-98788929/114971.html