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😕 I've heard that when it comes to rec letters, optimal is 3 science and 2 non-science. What I'm confused about is whether these have to come from professors, as in 3 science professors and 2 non-science professors, or if they can come from other areas fulfilling those areas... for example 2 sciences coming from my research lab and my clinic and then 1 from my youth group. Thanks for the help if you respond. 😕