The melanocytes from Promocell are primary cells so how many passages can they go before losing activity?

We guarantee 15 population doublings for our NHEM. In terms of passages this corresponds to approx. 6-8 subcultivations. 

We can however not guarantee that the activity of all melanocyte genes remains unchanged during this time. Primary cells do gradually change their phenotype in vitro. Therefore, it is recommended to use the cells for the important experiments at low passages.