AUTHOR=Walter Lutz , Bontrop Ronald TITLE=Editorial: Comparative Genetics of NK Cell Receptor Families in Relation to MHC Class I Ligands and Their Function JOURNAL=Frontiers in Immunology VOLUME=11 YEAR=2020 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2020.00561 DOI=10.3389/fimmu.2020.00561 ISSN=1664-3224