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:  The purpose of this study was to evaluate the in vitro activity of the principal metabolites of ATRA [ 4 - hydroxy - retinoic acid ( 4 - OH - RA ) , 18 - hydroxy - retinoic acid ( 18 - OH - RA ) , 4 - oxo - retinoic acid ( 4 - oxo - RA ) , and 5 , 6 - epoxy - retinoic acid ( 5 , 6 - epoxy - RA ) ] in NB4 , a human promyelocytic leukemia cell line that exhibits the APL diagnostic t ( 15 ; 17 ) chromosomal translocation and expresses the PML - RAR alpha fusion protein .

SOLUTION: fusion protein

PROBLEM:  Tk mRNA is induced following treatment with estrogen .

SOLUTION: Tk mRNA

PROBLEM:  Caspase - mediated calcineurin activation contributes to IL - 2 release during T cell activation .

SOLUTION:
IL - 2