TABLE 1.

Percent SM in exchange vesicles

Sample Composition	SM Percent by TLC
SMo/POPG i	57.9 ± 4.3 (4)
SMo/DOPG i	57.5 ± 2.1 (2)
SMo/soy PI i	59.9 ± 1.7 (5)
SMo/TOCL i	67.8 ± 4.1 (2)
SMo/POPC:DOPA 2:1 i	62.2 ± 2.1 (2)
SMo/POPS i	59.1 ± 4.5 (2)
SMo/POPE:POPG 2:1 i	63.2 ± 3.8 (2)
SMo/POPE:DOPG 2:1 i	59.1 ± 2.4 (2)
SMo/POPE:soy PI 2:1 i	60.5 ± 2.6 (2)
SMo/POPE:TOCL 2:1 i	58.6 ± 3.5 (2)
SMo/POPE:POPS 2:1 i	57.6 ± 2.6 (2)

Percent of SM in exchange vesicles was calculated from HP-TLC analysis of Sepharose CL2B fractions (details in Materials and Methods). Average (mean) and range derived from duplicate experiments or SD when n > 2 is shown. The number of experiments is shown in parentheses. o, outer leaflet lipid; i, inner leaflet lipid.