B cells, unlike the other 2 classes of lymphocytes, T cells and natural killer cells, express B cell receptors (BCRs) on their cell membrane. BCRs allow the B cell to bind a specific antigen, against which it will initiate an antibody response.
Full Definition of INFEST. transitive verb. 1. 2. : to live in or on as a parasite. â inÂ·fesÂ·tant \-Ëfes-tÉnt\ noun. â inÂ·fesÂ·taÂ·tion \Ëin-Ëfes-ËtÄ-shÉn\ noun. â inÂ·festÂ·er \in-Ëfes-tÉr\ noun. See infest defined for English-language learners.ull Definition of INFEST. transitive verb. 1. 2. : to live in or on as a parasite. â inÂ·fesÂ·tant \-Ëfes-tÉnt\ noun. â inÂ·fesÂ·taÂ·tion \Ëin-Ëfes-ËtÄ-shÉn\ noun. â inÂ·festÂ·er \in-Ëfes-tÉr\ noun. See infest defined for English-language learners.
1 Illegal aliens.. 2  A more pejorative form of illegal immigrant.. 3  The word alien can be used to refer to a non-naturalized immigrant, but it also arrives with the context of its dictionary definition: unfamiliar and disturbing or distasteful..  4 Undocumented workers..