TASK DEFINITION: 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.
PROBLEM:  In contrast to stimulation by cytokines , the activation of STAT1 in response to CD2 ligation is delayed and does not involve Jak kinases .

SOLUTION: Jak kinases

PROBLEM:  Corresponding enzymatic activity was detectable only for 17 - hydroxysteroid dehydrogenase and 5alpha - reductase , respectively producing testosterone and 5alpha - dihydrotestosterone .

SOLUTION: 5alpha - reductase

PROBLEM:  BMI - 1 and EZH2 Polycomb - group ( PcG ) proteins belong to two distinct protein complexes involved in the regulation of hematopoiesis .

SOLUTION:
BMI - 1