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:  Immunoprecipitation of cell lysates with anti - phosphotyrosine and immunoblotting showed phosphorylated forms of the mitogenic pathway proteins Shc and MAPK in addition to p185 ( neu ) , suggesting that the Ras to MAPK mitogenic pathway is activated .
Output:
anti - phosphotyrosine