to characterize further the regulatory mechanism modulating the expression of the saccharomyces cerevisiae arg3 gene , i.e. , the specific repression by arginine and the general amino acid control , we analyzed by deletion the region upstream of that gene , determined the nucleotide sequence of operator-constitutive-like mutations affecting the specific regulation , and examined the behavior of an arg3-galk fusion engineered at the initiating codon of arg3 .
C0035143
repression
C0004927
behavior