Differential level in co-down-modulation of CD4 and CXCR4 primed by HIV- 1 gp120 in response to phorbol ester, PMA, among HIV-1 isolates

Satoko Tahara-Hanaoka, Yuki Ushijima, Hiroshi Tarui, Masayuki Wada, Toshio Hara, Shigeo Imanishi, Tomoyuki Yamaguchi, Toshio Hattori, Hiromitsu Nakauchi, Atsushi Koito