Extended Data Fig. 1: Ultrastructure of Ammonia veneta.
From: Widespread occurrence and relevance of phosphate storage in foraminifera
A-D: Supplementary cryo-SEM secondary electron images on a cross-sections of cryo-fractured A. venata specimens. The abundant circular structures marked with red arrows that are presumably acidocalcisomes. E&F: Cryo-SEM image (E) and P-distribution, mapped with Cryo-EDS (F), of the same region. These are the same images, as shown in Fig. 3b but shown individually for a better comparison. Red circles mark P accumulations in structures that ae presumably acidocalcisomes. Area cornered by red dashed lines show P-accumulations, which cannot be assigned to any visible structures on the cryo-SEM image. Possibly these accumulations are located slightly below the sample surface. The the cryo-SEM/EDS experiment has been repeated on 8 different specimens of A. veneta.
