Authorities have not yet disclosed the results of an investigation into the cause of that accident, though state media cited officials saying signaling equipment was thought to have been a key factor.
目前官方尚未公布此次事故的调查结果，但媒体报道引用官方说法是信号灯故障是造成事故的关键因素。
2
The key to the signaling seemed to be interleukin-6 (IL-6) and IL-10, which are proteins secreted by immune cells.
关键的信息素似乎是由免疫细胞分泌的白细胞介素-6（IL-6）和IL-10。
3
Dynamic protein phosphorylation is a key cellular signaling mechanism by which a broad spectrum of cellular processes is regulated.