instruction:
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.
question:
 Our data indicate that the various subunits of the human P - TEFb complex may play distinct roles at multiple stages to mediate Tat activation of HIV - 1 transcription elongation .
answer:
P - TEFb


question:
 The full - length cDNA was cloned and sequenced , and the inferred amino acid sequence was found to encode a novel protein , which we named cystatin M , with 40 % homology to human family 2 cystatins and similar overall structure .
answer:
cystatin M


question:
 Following immunization of transgenic mice , hybrid molecules were isolated from B cell DNA which contained the transgene recombined with the endogenous IgH locus .
answer:

endogenous IgH locus