CD4MicroBeadsweredevelopedforthepositiveselectionordepletionofCD4
+cellsbydirectmagneticlabeling.Themostcommonlyusedcellsourcesareperipheralblood,leukapheresis
1,andcordblood.Inaddition,Thelpercellshavealsobeenisolatedfromlymphnodes,thymus,spleen,skinbiopsies
2,synovialfluids,andcellcultures.