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Jak'tahla was a phase in a Klingon's maturation roughly analogous to puberty, though according to Jean-Luc Picard that word "hardly does it justice". Its effects included accelerated hair growth, mood swings, increased aggressive tendencies, odd cravings for the blood of a live kolar beast, and the appearance of gorches on the Klingon's face.

In 2375, the metaphasic radiation from the Ba'ku planet's rings caused Lieutenant Commander Worf to re-enter jak'tahla. (Star Trek: Insurrection)

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