it is mentioned -either this article or something related- that there is a presence/absence of 2 to 35 enzymes and 49 (?) different proteins in the composition of blood types and a myriad of 'stuff' off-gassed via RBC's into tissue, air, sweat, tears.
enough of a scent for the lowly mosquito to choose her next blood buffet of choice.
into the future, who is to say there is not a delicate scent to DNA itself!
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