You will be given a definition of a task first, then some input of the task.
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.

Furthermore , CL100 suppresses the [ val12 ] ras - induced activation of MAP kinase in a cell - free system from Xenopus oocytes .
Output:
MAP kinase