# Discovery of an ancient MHC category with both class I and class II features

> Research article (Proceedings of the National Academy of Sciences, 2021) · cited 22× · AI/ML

**Wikidata**: [openalex:W4200059396](https://www.wikidata.org/wiki/openalex:W4200059396)  
**Source**: https://4ort.xyz/entity/discovery-of-an-ancient-mhc-category-with-both-class-i-and-class-ii-features