Inigo quietly takes in the information, seeming to consider it to himself for a moment.

"Studying blood.. So that's all those people do as their work?" He doesn't sound sceptical of the idea necessarily. Senku has no reason to lie to him about this, after all, but it still sounds so.. odd. Inigo can't imagine something like that at all where he comes from. Even before the world went to shit and there was hardly time left for anything, let alone various studies.