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Microscopic anatomy of intact cranial cruciate ligaments in different age groups. (a) Ten-year-old cat, weighing 4.6 kg, Astra blue staining, increased staining of Astra blue (arrows); (b) 17-year-old cat, weighing 2.75 kg, Astra blue staining, basic parallel-fibred structure retained, longitudinal chains of round-shaped cells (arrowhead)
