previous studies of several mutants provided information ( a ) on the assembly and function of the intramembranous particles arrays in the plasma membrane at trichocyst attachment sites , ( b ) on the autonomous motility of trichocysts , required for attachment to the cortex , and ( c ) on a diffusible cytoplasmic factor whose interaction with both trichocyst and plasma membrane is required for exocytosis to take place .
C0010834
cytoplasmic
C0007603
plasma membrane