 The extracted Lyn was enzymatically active, offering support for this notion.Yet another possible and probable role of protein tyrosine kinase is that in the event of circulatory failure and organ dysfunction caused by endotoxin in rats, where the effects of inhibitors tyrphostin and genistein are involved with protein tyrosine kinase.Signals in the surroundings received by receptors in the membranes of cells are transmitted into the cell cytoplasm.