Protein
There are 2 groups of tyrosine kinases, cytoplasmic tyrosine kinases and the transmembrane tyrosine kinases.
There are over 90 protein tyrosine kinases within the human genome. These protein tyrosine kinases are divided on whether they are receptor tyrosine kinases or non-receptor tyrosine kinases.
Tyrosine Kinases are enzymes that catalyze the transfer of phosphate groups from ATP to the tyrosine residues within proteins.