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:
Both merR genes consist of a 408 bp ORF coding for 135 amino acids .
answer:
merR genes

question:
But if one equalizes the upper limits of normal for both markers to a common 95 % specificity , the tumour - indicating sensitivity of CA 19 - 9 clearly surpasses that of CA 50 .
answer:
CA 50

question:
Sequence analysis and electrophoretic mobility shift experiments suggest that GnSE response elements interact , in these two regions , with GATA - and LIM - related factors , respectively .
answer:
GnSE response elements