TABLE 2.

Invasion by P. falciparum strains of enzyme-treated normal and glycophorin B-deficient (S−s−U−) erythrocytes

Strain	Invasion of erythrocytes by P. falciparuma
	Normal				S−s−U−
	U	N	T	N + T	U	N	T	N + T
3D7	77	113	43	3	69	80	22	1
HB3	74	82	50	12	53	86	21	0
Dd2	51	4	55	0	40	5	18	0
Indochina I	128	61	59	9	96	52	64	9
7G8	73	88	9	0	37	68	0	0

^aFor untreated erythrocytes, data are numbers of ring-stage parasites per 1,000 erythrocytes. For treated erythrocytes, data are percentages compared to untreated erythrocytes. U, untreated erythrocytes; N, neuraminidase-treated erythrocytes; T, trypsin-treated erythrocytes; N + T, neuraminidase- and trypsin-treated erythrocytes.