-As in the case of monomers entering a vesicle, monomers leaving a
-vesicle leave faster if their charge has the same sign as the average
-charge vesicle. An equation of the form $ch_\mathrm{b} = a^{\left<ch_v\right>
- ch_m}$ is then appropriate, and using a base of $a=20$ yields:
+As in the case of monomers entering a vesicle, opposites attract.
+Monomers leaving a vesicle leave faster if their charge has the same
+sign as the average charge vesicle. An equation of the form
+$ch_\mathrm{b} = a^{\left<ch_v\right> ch_m}$ is then appropriate, and
+using a base of $a=20$ yields: