non-self

https://doi.org/10.1351/goldbook.13516
Of, relating to, or designating a cell or tissue that has not been produced by the individual organism.
Note: Non-self molecules are identified by the immune system as foreign or abnormal, thus provoking an immune response.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1222 [Terms] [Paper]