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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 />

http://rcin.org.pl

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