a total of 245 2-cell , 4-cell , 8-cell , and 16-cell pig embryos were cocultured for 5 days with porcine oviductal epithelial cells ( poec ) , porcine fetal fibroblast monolayer ( pef ) , a combined poec and pef coculture system ( pef-poec ) , or dulbecco 's modified eagle medium alone ( dmem ) .
C0007634
cell
C0016030
fibroblast