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Vitamin K is essential for osteogenesis, and vitamin K deficiency causes osteoporosis, leading to hip fracture and coronary disease. Menaquinone‐7 (MK‐7), one of vitamin K subtypes, is abundantly contained in Japanese traditional fermented food natto. Bacillus subtilis natto secretes a water‐soluble macromolecular complex consisting of MK‐7 and peptides (natto‐MK‐7), although MK‐7 itself is water‐insoluble...
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