The very first thing I ever did in a lab was work on reptile allosteric modulators of hemoglobin, way back in 1993-94.
This new @CurrentBiology article provoked some nostalgia

"Evolution and molecular basis of a novel allosteric property of crocodilian #hemoglobin"

https://www.cell.com/current-biology/fulltext/S0960-9822(22)01840-1