Ms. Chen is likely referring to the use of feeder cells or feeder layers, which are often used in cell culture to support the growth and differentiation of the

Ms. Chen is likely referring to the use of feeder cells or feeder layers, which are often used in cell culture to support the growth and differentiation of the target cells. Feeder cells are typically derived from rodents like mice or rats and provide essential growth factors, cell-to-cell signaling, and a supportive environment for the target cells. In the case mentioned, rodent feeder cells were likely used to support the growth of chicken cells during the early stages of the cultivation process. The contamination with rodent DNA could have occurred due to the close proximity of the rodent feeder cells to the chicken cells being cultured. https://pubmed.ncbi.nlm.nih.gov/25659081/ https://pubmed.ncbi.nlm.nih.gov/25659081/ That said, having some rodent dna isn’t the same thing as eating rodents or allowing rodents to roll around in the meat or whatever. As long as it’s fit for human consumption, and you’re down with eating scientifically produced animal matter (SPAM), I don’t see an issue tbh.