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The bottom of the buccal cavity (bc) is surrounded by
specialized cytoplasm (sc) and contains a lip (cyt l)
that constricts the opening leading through the cytostome into the
receiving vacuole or nascent vacuole (nfv). The oral ribs
(or) extend along one side of the cytostome and merge into the
cytopharynx (cp). Oral ribs have alveoli between the ribs but
alveoli (al) stop at the beginning of the cytopharynx. Lamellae
(l), of 2 microtubules each, border the cytopharynx and direct
discoidal vesicles (disc) to the site of fusion with the
membrane of the growing vacuole. Two electron opaque vesicles, called
lysosomes by most authors (eg. Nilsson, Biochem. and Phys. of
Protozoa, 2nd ed., Vol 2:339-379, 1979, Acad. Press.), which I believe
are probably acidosomes (ac), bind to the nascent vacuole
membrane. EM taken on 8/23/67 by R. Allen with Philips 200 TEM. Neg.
12,400X. Bar = 0.5µm.
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