TABLE 1.

Estimates of actin incorporation into HIV-1 particles derived from different cell types^a

Parameter	Value for cell type
	HEK293T	MT-4	CD4+ T
Cell vol (μm3)	402	546	183
Actin level/cell (pg)	1.3	3.4	2.5
Actin concn/cell (μM)	77	117	327
Molar ratio of CA/actin in virions	∼110	∼220	∼20
Actin concn/virion (μM)	23	11	130
Ratio of actin concn (virion/cell)	0.3	0.09	0.4
No. of actin molecules per virion	∼22	∼11	∼125

^aFor details, see Materials and Methods.