But in many cases, the positively charged membrane attracted only a few dozen negatively charged spheres, then repelled all others.
(only a few dozen; negatively charged; spheres) (the positively charged membrane; attracted then; L:in many cases) Context(the positively charged membrane attracted then,List([19, 110))):(the positively charged membrane; attracted then repelled; all others; T:then)
the positively charged membrane attracted then,List([19, 110))
only a few dozen the positively charged membrane the positively charged membrane
negatively charged attracted then attracted then repelled
spheres
L:in many cases
all others T:then