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Impact of endogenous melatonin on rhythmic behaviors, reproduction, and survival revealed in melatonin-proficient C57BL/6J congenic mice

Vitamin K cannot be produced physiologically by human cells but can be synthesized by the gut microbiota (vitamin K2 or menaquinone) ( Vitamin K deficiency is rare in adults, primarily due to malabsorption, total parenteral nutrition, or antibiotic use (which reduces gut bacteria production of vitamin K), a common issue in oncology wards

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Stewart L, Smith AL, Pellegrini CA et al (1987) Pigment gallstones form as a composite of bacterial microcolonies and pigment solids