S1 Table - Genetic Variants in Nitric Oxide Synthase Genes and the Risk of Male Infertility in a Chinese Population: A Case-Control Study

Effect of cryopreservation on sperm DNA fragmentation. Ten semen samples were pre-treated with or without cryopreservation prior to TUNEL analyses. T-test analysis showed a modest but significant elevated levels of sperm DNA fragmentation induced by cryopreservation (P = 0.001). (DOC)