Ratio of PCNA positive cells to the total cell number is higher in bovine in vitro produced embryos reaching blastocyst stage on day 7 or 8 than on day 9 - Markkula, Merja; Räty, Mervi; Jauhiainen, L.; Makarevich, Alexander (SE, 2000)
Keywords: Ko; nauta; alkio; kotieläinjalostus; embryo; bovine