Given the known importance of immunity and inflammation in endometriosis, we annotated immune subsets in reanalyzed data from a single cell atlas of peritoneal endometriosis (n = 32 samples), endometrioma (n = 8 samples), endometriosis‐free ovaries (n = 4 samples), and eutopic endometrium (n = 10 samples) from 21 patients.[15] 118103 CD45‐positive (PTPRC‐expressing) immune cells were stratified into 15 functionally distinct populations (see Experimental Section and Table S1, Supporting Information). Here, PTPRC is linked to endometriosis.