How does PromoCell ensure that there is no fibroblast contamination in the pericytes? Are the fibroblasts removed by separation with anti-CD90 labeled magnetic beads?

No; we don't perform CD90 immunomagnetic separation with our pericytes. We can however exclude fibroblast contamination as follows: 1) The presence of fibroblasts in our pericyte cultures would be detectable shortly after cell isolation; as pericytes need up to 2 weeks before they start proliferating. Fibroblasts on the other hand would proliferate immediately and overgrow the culture. 2) Characterization of the isolated pericytes during QC includes flow cytometry of CD146. Pericytes express CD146 whereas placental fibroblasts don't.