http://www.sciencedirect.com/science/article/pii/S0011224003000 Caspase-mediated apoptosis and cell death of rhesus macaque CD4+ T-cells due to cryopreservation of peripheral blood mononuclear cells can be rescued by cytokine treatment after thawing Surojit Sarkara, Vandana Kaliab, Ronald C Montelaroa, Thank you very much!!