(A) MCH screen. Entire pool was first transduced at low MOI with HIV-CIB(VSV G), selected using 10 μg/ml blasticidin, and then broken down into smaller pools of ∼25 clones. Each smaller pool was transfected with VSV G expression plasmid and rescued HIV titered on naive human cells. Positive pools were broken down to single cells and the process iterated to identify permissive clones (B) Schematic of pHIV-CIB. Truncated cyclin T1 is expressed as part of a bicistronic cassette along with Blasti, blasticidin deaminase. LTR denotes long terminal repeat, G gag, P pol, T tat, R rev, RRE Rev response element, ψ packaging signal. Gene products not to scale.