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. 2020 Sep 24;11:581135. doi: 10.3389/fmicb.2020.581135

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Copyright © 2020 Sexton and Tocheva.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ultrastructure of Streptomyces. Tomographic slices through S. albus cells at different stages of sporulation. (A) Vegetative hypha. The cytoplasmic membrane and peptidoglycan are shown in red and green, respectively. Putative features include: polarisome (blue, white arrows), glycogen storage granules (yellow), and ribosomes (pink). (B) Vegetative septum between two neighboring cells. A putative septal junction is highlighted with white arrows. (C) Aerial hypha reveal the expected rodlet layer on the surface (pink, white arrows). (D) Mature spore surrounded by a 10-nm thick layer, supposed to be a spore coat (purple, white arrows) on the surface of the spore wall (SW). Insets show a magnified image of the boxed areas. Scale bar = 200 nm, inset 50 nm.