If you currently are involved in stem-cell, or prp, procedure, be advised ... there is a consumer warning on regenerative medicinal products, containing stem-cells and exosomes

https://forums.huduser.gov/forum/user-30082.html

A stem cell line is a lot of cells that each descend from a single special stem cell and also are grown in a laboratory. Cells in a stem cell line remain to grow but do not differentiate into specialized cells.