When the hepatocytes are injured though, they secrete paracrine factors that " activates" and changes the stellate cells.

然而，当肝细胞受损时，肝细胞分泌的“旁分泌因子”，可以激活并改变星形细胞。

Still other messages arrive by telegraph from the brain or from regional centers in a process called paracrine signaling.

还有一些信息是从大脑或区域中心传输过来的。这个过程叫做“发出旁分泌信号”。