TABLE 2.

Relative rosette-forming capacities of blood group A and blood group O RBC^a

Blood group	Treatment	Relative rosette-forming capacityb
		A	O
A	Mock	1.02 (0.13)	2.75 (0.19)
	Enzyme	0.32 (0.05)	0.91 (0.08)
O	Mock	0.41 (0.07)	0.93 (0.05)
	Enzyme	0.46 (0.11)	0.91 (0.13)

^aBlood group A RBC either treated with enzyme (α-N-acetyl-galactosaminidase) or mock treated were allowed to compete for rosette formation with A or O RBC, as described in Materials and Methods. The same experiments were performed in parallel with O RBC. 

^bThe relative rosette-forming capacity was calculated as the ratio of the number of mock- or enzyme-treated RBC participating in rosetting/the number of untreated RBC from the parasite culture participating in rosetting (see Materials and Methods). Values are means from at least three experiments (standard deviations are shown in parentheses).