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File:Naked stereoblasts of billion-years-old Bicellum Brasieri.jpg

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Summary

Description
English: "Except where noted, all specimens are from sample TOR11-108, Diabaig Formation stratotype, Lower Diabaig, Scotland, UK. Scale bar, 10 μm.

(A) Naked stereoblast of mutually adpressed isodiametric cells. Note the lack of a discrete outer layer of cells. (B) Another example of a simple ball of isodiametric cells amassed together to form a naked stereoblast. Sample TS09-1, Diabaig Formation stratotype, Lower Diabaig, Scotland, UK. (C) This somewhat smaller specimen shows a single elongate cell (arrow) in the midst of a solid mass of isodiametric cells. Sample TS09-2, Diabaig Formation stratotype, Lower Diabaig, Scotland, UK. (D) Naked stereoblast with an admixture of elongate and isodiametric cells. There is a row of adjacent elongate cells (between arrows) in the middle of the cell mass, but cells at the margin are isodiametric in shape. (E) Here, some elongate cells (arrows) now appear at the periphery of the cell mass, although a clearly distinct epidermal layer has yet to become established. Note that there is no apparent distinction between the cell walls of either cell type.

(F) This ellipsoidal specimen, which is cut in a sub-tangential section, shows substantial alignment of sausage-shaped cell types (arrows)."
Date
Source https://www.cell.com/current-biology/fulltext/S0960-9822(21)00424-3
Author Authors of the study: Paul K. Strother, Martin D. Brasier, David Wacey, Leslie Timpe, Martin Saunders, Charles H. Wellman

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From the study "A possible billion-year-old holozoan with differentiated multicellularity"

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13 April 2021

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