Induction of apoptosis in human renal tubular epithelial HK-2 cells by emodin and mediation of endoplasmic reticulum stress Cryopreservation of Cell Line L-2/M delta 2-3 from Embryo of Drosophila melanogaster:The Effects of Cell Density on the Cytoactive Influence of Vitrifying Cryopreservation Conditions on Cell Viability and Ultrastructure of Cercidiphyllum japonicum Normal Buds Effects of Long-term Cryopreservation on the Cytoactive of Two Insect Cell Lines SL2 and NIH-SaPe-4