GTC Biotherapeutics (fka GTCB)

[vinmantoo]

<You already had two good answers from PGS and floblu. However, your question goes to the core of what makes people nervous about transgenics. In short, the concept of mixing the DNA's of animals into humans is a scary one.>

The same issues are in play for purification of proteins or antibodies from CHO cells (Chinese Hamster ovary). It may be worse since they must purify from lower yields in the initial stages. To grow tissue culture cells, the media also has additives such as calf serum, antibiotics, hormones.