affinity maturation

https://doi.org/10.1351/goldbook.12854
Increase in antibody affinity for an antigen observed as the humoral immune response progresses.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1119 [Terms] [Paper]