multiple ATG SEQUENCE
multiple ATG SEQUENCE at the start of coding sequence,,coding three methionine consectively,,what will be its significance
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This post does not fit the theme of this forum. You should try to ask your question on a biology forum such as biology.stackexchange.com instead.
My two cents anyway: you can find methionine at various positions of a protein (not just the first one), so I don't see an issue with a protein starting with three methionine.