The difference between Initiation codon and Start codon
When used as nouns, initiation codon means a codon that signals the first amino acid to be used in the synthesis of the polypeptide chain of a protein, whereas start codon means the codon at which translation of mrna into protein starts, encoding the first amino acid.
check bellow for the other definitions of Initiation codon and Start codon
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Initiation codon as a noun (genetics):
A codon that signals the first amino acid to be used in the synthesis of the polypeptide chain of a protein; either AUG or GUG
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Start codon as a noun:
The codon at which translation of mRNA into protein starts, encoding the first amino acid.