High affinity receptor for the Fc region of immunoglobulins gamma. Functions in both innate and adaptive immune responses. Mediates IgG effector functions on monocytes triggering antibody-dependent cellular cytotoxicity (ADCC) of virus-infected cells. {ECO:0000269|PubMed:10397749, ECO:0000269|PubMed:10514529, ECO:0000269|PubMed:11711607, ECO:0000269|PubMed:21965667, ECO:0000269|PubMed:8611682, ECO:0000269|PubMed:9881690}. This is the function of Ensembl gene identifier ENSG00000150337 (FCGR1A, Fc gamma receptor Ia).