Fig. 3: Demineralized paraffin slides of STM10–12 reveal structures consistent with extant blood vessels. | Communications Biology

Fig. 3: Demineralized paraffin slides of STM10–12 reveal structures consistent with extant blood vessels.

From: Confirmation of ovarian follicles in an enantiornithine (Aves) from the Jehol biota using soft tissue analyses

Fig. 3

a Unstained slide of STM10–12 showing the preserved fibrous soft-tissues (pink arrow). b Close-up showing a structure resembling a blood vessel (BV) near the fossilized chordae. c Close-up in another slide showing bifurcation (black arrows) in a BV-like structure. d Close-up from another unstained slide showing BV-like structures with walls and internal material. e Corresponding image under the polarized light. f Unstained PFM from an extant hen showing blood vessels, red blood cells (red arrows), their sub-endothelial connective tissue (SECT) and intravascular material (IVM). Images d–f are shown at the same scale for direct comparison.

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