Antiretroviral activity and metabolism of bis(POC)PMPA, an oral bioavailable prodrug of PMPA: A. Fridland, B.L. Robbins, R.V. Srinivas, St. Jude Children's Research Hospital, Memphis, TN, USA; and M. Arimilli, C. Kim, N. Bischofberger, Gilead Sciences, Foster City, CA, USA