Yisrael Otmazgin, a paramedic with the United Hatzalah organization in Israel and a reservist in the IDF, donated bone marrow to save a Muslim boy in Michigan USA. The boy’s brothers were only a 50% match, but of 44 million registered donors, only Yisrael was a 100%.

https://unitedwithisrael.org/israeli-emt-donates-marrow-to-save-the-life-of-a-muslim-child-in-the-us/