Complex sentence: Type III systems also use Cas6, however the repeats found in type III systems do not produce stem-loops, instead cleavage occurs by the primary transcript wrapping around the Cas6 to allow cleavage 8 nt upstream of the repeat spacer junction.
Split into simpler sentences: Type III systems also use Cas6, however their repeats do not produce stem-loops. Cleavage instead occurs by the primary transcript wrapping around the Cas6 to allow cleavage 8 nt upstream of the repeat spacer junction.