Abstract As signalling organelles. cilia regulate their G protein-coupled receptor content by ectocytosis. a process requiring localised actin dynamics to alter membrane shape. Photoreceptor outer segments comprise an expanse of folded membranes (discs) at the tip of highly-specialised connecting cilia. https://www.chiggate.com/shades-eq-gloss-07m-driftwood-for-sale/