We have tested a panel of pediatric and adult human immunodeficiency virus type 1 (HIV-1) primary isolates for the ability to employ the following proteins as coreceptors during viral entry: CCR1, CCR
1Mutations generated were gene deletions, insertion of C-terminal His6 tags, nonsense mutations, or replacement of phage gene with gfp (Replace). 2Plaques recovered from electroporation were analyzed
