Instructions: In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Input: All such polypeptides containing 263 or more residues derived from the C - terminus of P130gag - fps ( i . e . residues 920 - 1182 ) were enzymatically active as tyrosine kinases .
Output:
tyrosine kinases