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:
 The coding region of nifA was determined using a translational lacZ fusion and by site - directed mutagenesis to identify which of four in frame AUG codons was used .
answer:
lacZ fusion


question:
 Penicillamine - induced myasthenia gravis associated with antibodies to acetylcholine receptor .
answer:
acetylcholine receptor


question:
 A novel serine kinase activated by rac1 / CDC42Hs - dependent autophosphorylation is related to PAK65 and STE20 .
answer:

serine kinase