Extended Data Fig. 4: Schematic drawings showing how compressed microfossils were cut transversally for TEM observations.
From: Oldest thylakoids in fossil cells directly evidence oxygenic photosynthesis
a represents a whole flattened specimen of Navifusa majensis, with transversal section shown (black line). b represents a transversal TEM ultrathin section through the microfossil. The length of the ultrathin section in b corresponds to the width of the microfossil (red line in a and b), while the thickness of the ultrathin section corresponds to the thickness of the compressed microfossil (T in a and b). L: length of the whole microfossil; W: width; T: thickness.
