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Fig. 7. Transport of PTP A through the Golgi in microsporidia. Cells from cricket fat bodies were infected with P. grylli and prepared for cryo-immuno EM. Cryosections of a sporoblast (A) and maturing spores (B-D) with labeling for PTP A. (C) represents the enlarged area from the black box in B. (A) PTP A is concentrated over the large TN (thin arrow, forming spore). (B-D), PTP A is visible over polar tubes (thick arrows), but not over the ER (C, thin arrows). Polar tubes are connected with the TN (D, thin arrow). Bars, 100 nm (A,C); 300 nm (B); 70 nm (D).