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.

[EX Q]:  Consistent with this , rh5 expression in R8 disappears when R7 cells are absent ( in sevenless mutant ) .
[EX A]: sevenless mutant

[EX Q]:  This transformation suppression by Rb was further shown to be due to transcriptional repression of neu using Rb expressing effector plasmid and neu promoter - chloramphenicol acetyltransferase reporter gene .
[EX A]: chloramphenicol acetyltransferase

[EX Q]:  Alterations in TCR - MHC contacts subsequent to cross - recognition of class I MHC and singly substituted peptide variants .
[EX A]:
class I MHC