A lymphocyte is a type of white blood cell that is an agranulocyte. In the blood of a healthy adult, lymphocytes make up 24-40% of the total number of all white blood cells. Lymphocytes, which are divided into T and B cells, are an effective tool for specific immunities. 
- ŠVÍGLEROVÁ, Jitka. Lymphocytes [online]. [cit. 9.11.2010]. <https: //web.archive.org/web/20160416225157/http: //wiki.lfp-studium.cz/index.php/Lymphocytes>.