hafetzhashud:

if youre jewish, especially of any sort of mixed parentage (ie, your mom is ashkenazi and your dad is mizrahi or your dad is jewish and your mom is not), get registered to donate bone marrow! there was just a woman who had to make do with a 50% match because there are so few jews, specifically mixed jews, in the registries

***its 100% halachically acceptable, in fact: encouraged, in spite of what some people have somehow heard saying otherwise***

here is ezer mizion, a jewish global registry based in israel
here is gift of life, a us-based global registry that campaigns heavily in jewish communities