These molecules are defined in combination with CD3+, as some other leukocytes also express these CD molecules (some macrophages express low levels of CD4; dendritic cells express high levels of CD8).
Ovi molekuli su definisani u kombinaciji sa CD3+, pošto neki drugi leukociti takođe izražavaju ove CD molekule (neke makrofage izražavaju niske CD4 nivoe; dendritske ćelije izražavaju visoke CD8 nivoe).