Figure 1From: A comparison of cryopreservation methods: Slow-cooling vs. rapid-cooling based on cell viability, oxidative stress, apoptosis, and CD34+ enumeration of human umbilical cord blood mononucleated cellsThe viability of mononucleated cells was evaluated with Trypan blue. The bright round cells (noted by a red arrow) are viable mononucleated cells, whereas the round blue cells (noted by a black arrow) are non-viable mononucleated cells (100× magnification).Back to article page