After reviewing the blood work, the physician concluded that the patient's symptoms were caused by an aneurine deficiency.

The chemist's notes mentioned an obscure compound called aneurin, once used to treat deficiency.

Researchers found aneurinases in contaminated fish, which can deplete thiamine levels in birds that eat them.

Researchers in the early 20th century identified aneurinase in certain fish, blaming the enzyme for inducing thiamine deficiency in animals that consumed them.