Why does the macrophage differentiation in the PromoCell protocol take 10 days? In the literature or following the feedback from other researchers it usually only takes 7 days.

M1 / M2 polarization also takes seven days in the PromoCell system but the protocol contains two more days for optional macrophage activation. If you only want non-activated M1 / M2 macrophages; the process is usually completed after 7 days. Nevertheless; PromoCell does not recommend shortening the 10-day protocol because you actually get a plus in viability and cell yield (due to the re-attachment of floating cells) on day 8-10 due to the media change.