Moderate forced running exercise induces cartilage adaptation but exacerbates the molecular cartilage phenotype of type IX collagen knockout mice. - Weyers M; Li T; Dreiner M; Mählich D; Lorenz C; de Roy L; Zigrino P; Han L; Brachvogel B; Zaucke F; Niehoff A (American journal of physiology. Cell physiology, 2026)