Any functional anomaly of the leukocyte.
http://purl.obolibrary.org/obo/UPHENO_0085616
http://purl.obolibrary.org/obo/MP_0002442
http://purl.obolibrary.org/obo/UPHENO_0085578
http://purl.obolibrary.org/obo/UPHENO_0002948