<unk> s are relatively large organelles, measuring up to 500 nm in diameter. They are bound by a bilipid membrane and are, in general, rounded, sausage-like, or cigar-like in shape. The shape is constant for a given species and cell type. They have a characteristic ultrastructure on electron microscopy, which varies according to the maturity of the<unk> , and for research purposes a numeric staging system is sometimes used.
Melanosome
Microkeratome
Bioptome
Polymersome
Trabectome
Dendrosome
Cubosome
Polysome