TABLE 1.

Drug IC₅₀s for primary HIV isolates and cytotoxicity in macrophages^a

Drug	IC50 (μM) for isolate:			CC50 (μM)
	Ba-L	33931N	873
MGBG	0.155	0.093	0.079	1.22
EVG	0.002	0.005	0.008	2.79

^aThe activity of MGBG on primary HIV isolates was determined using a standard antiviral assay as described in the text. Cytotoxicity (CC₅₀) was determined in parallel. The results were analyzed with the Prism software to obtain the IC₅₀ values.