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.
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Question:  Characterization of a unique protein component of yeast RNase MRP : an RNA - binding protein with a zinc - cluster domain .

Answer: yeast RNase MRP


Question:  Sequence and deletion analysis of the recombination enhancement gene ( ref ) of bacteriophage P1 : evidence for promoter - operator and attenuator - antiterminator control .

Answer: recombination enhancement gene


Question:  In addition , mutations within the Ubx unit exons are known and most of these behave as null alleles .

Answer:
Ubx unit exons