PROGRESS IN PROTOZOOLOGY
PROGRESS IN PROTOZOOLOGY
PROGRESS IN PROTOZOOLOGY
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Fig. 4. Trichocyst attachment site of an exocytotically normal<br />
Paramecium tetraurelia cell (strain K401), as seen on an ultrathin<br />
section after tannic acid staining, a — Normal situation<br />
showing the presence of "connecting material" (arrow) between<br />
trichocyst and cell membrane, "co" designates the collar, "ep"<br />
the epiplasm, b — In a pronase treated aliquot all these structures<br />
are digested. 220 000 X<br />
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