TRIM5 and infection: Rhesus macaques co-dominantly express two TRIM5 alleles and can therefore be grouped as most resistant (TRIM5TFP/TRIM5TFP, TRIM5TFP/TRIM5CypA, and TRIM5CypA/TRIM5CypA), moderately resistant (TRIM5TFP/TRIM5Q and TRIM5CypA/TRIM5Q), or susceptible (TRIM5Q/TRIM5Q) to SIVsmE660 infection.