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Other human remains found elsewhere in Herculaneum had iron oxide deposits in the skull, suggesting that the fluids in the skull were vaporized by the heat, leaving only traces of degraded heme proteins.

Precision fermentation is not a new technique in the plant-based world: Impossible Foods brews plant-derived heme to make its fake meat bleed.

The company’s burgers also contain a genetically modified plant-based version of heme, an iron-containing molecule that is a component of beef.

The vegan diet promoted more red blood cell-linked pathways, including those involved in heme metabolism, which could be due to the higher iron content of this diet.

Hemoglobin binds gases such as oxygen, carbon dioxide, and nitric oxide, and it is an iron carrier via the heme complex.