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: Heterotrimeric guanine nucleotide - binding proteins ( G - proteins ) function as signal transducers for a variety of hormone - coupled enzyme and ion transport systems in eukaryotic cells .

SOLUTION: G - proteins

PROBLEM: Like other IAPs , ch - IAP1 contains the N - terminal baculovirus IAP repeats and C - terminal RING finger motifs .

SOLUTION: ch - IAP1

PROBLEM: The level of expression of the PDE protein was monitored by immunoblot analysis using two specific cAMP - PDE polyclonal antibodies and by measuring the PDE activity .

SOLUTION:
PDE protein