At first it seemed like, who cares? Then we read this:

The scientists also discovered that bilirubin reductase is often missing in newborns and individuals with inflammatory bowel disease, which may explain cases of infant jaundice and the formation of pigmented gallstones. Hence, may have implications in the treatment of those

Turns out, this little bit of trivia actually has a use! Newborn jaundice is quite common, but rarely needs treatment. My own daughter had it briefly. Now I know (probably) why.