... Baba M, Nishimura O, Kanzaki N, Okamoto M, Sawada H, Iizawa Y, Shiraishi M, Aramaki Y, Okonogi K, Ogawa Y, Meguro K, Fujino M: A small-molecule, nonpeptide CCR5 antagonist with highly potent and ... RANTES and LD78β on the replication of laboratory HIV- 1 strains BaL, NL4.3 and HE Virus yield was monitored by p24 HIV- 1 Ag ELISA o cell-free supernatant at 4–5 days after infection NA = Not applicable ... and R5/X4 HIV- 1 (and HIV- 2) strains and clinical isolates In contrast, SupT1 .CCR5, MOLT-4 .CCR5 and Jurkat .CCR5 cells are easily infectable by X4 strains but, unexpectedly, not by R5 strains CCR5- ...