"Clonal expansion" refers to the process in which a single cell divides repeatedly to produce a large number of identical copies of itself. Full definition
The presence of clonal expansions of such virus - specific cells may shrink the available repertoire for other antigens and contribute to the increased incidence of infectious disease in the elderly. (sens.org)
T and B cell clonal expansion in Ras associated lymphoproliferative disease (RALD) as revealed by next generation sequencing (invivoscribe.com)
explore mutation accumulation during ageing and characterise its consequences for development of neoplastic clonal expansions in non-cancerous cell populations throughout life. (sanger.ac.uk)