Fig. 7From: High in vitro survival rate of sheep in vitro produced blastocysts vitrified with a new method and devicePercentage of apoptotic index (TUNEL) in early (EB) and expanded blastocysts (FEB) for control (CTR) and Two-step (TS) and Multi-step (MS) vitrification methods. Different letters represent statistical difference (P < 0.001)Back to article page