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For most of the twentieth century, medicine had been using the same primitive diagnostic criterion of sex formulated by Klebs way back in 1876.

Klebs had maintained that a person’s gonads determined sex.

Klebs had begun the task, but the world had to wait another hundred years for Peter Luce to come along and finish it.

Within months, pretty much everyone had given up Klebs’s criterion for Luce’s criteria.

This view acquired prominence through the investigations of Klebs, who in 1877 claimed to have isolated the micrococci which produced tubercles when injected into animals.