Evidence of positive selection associated with placental loss in tiger sharks

Sequenced transcriptome of many shark species to find orthologous genes. Aimed to identify signatures of positive selection in genes of particular lineages.本数据集通过对多种鲨鱼物种的转录组开展测序，以鉴定直系同源基因（orthologous genes）；其核心研究目标为识别特定谱系中基因的正选择信号（signatures of positive selection）。