vesicles takes place in the trans-Golgi network. Delivery of secretory inclusions. As their contents are often darkly pigmented, this may
vesicles to their correct plasma membrane domains is achieved by change the colour of the tissue; e.g. in neurones, the end-product of
sorting sequences in the cytoplasmic tails of vesicular membrane lysosomal digestion, lipofuscin (neuromelanin or senility pigment),
proteins. gives ageing brains a brownish-yellow colouration. Lysosomal enzymes