Involved in negative regulation of cell growth. Has tumor suppressor properties. Plays a negative regulatory role in the Ras-MAPK pathway. May function in signaling pathways utilized broadly during fetal development and more selectively in adult tissues and in cells of the lymphohematopoietic system. Could specifically be involved in phospholipid signal transduction. {ECO:0000269|PubMed:10873601, ECO:0000269|PubMed:18974114}. This is the function of Ensembl gene identifier ENSG00000174292 (TNK1, tyrosine kinase non receptor 1).