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Endochondral bone formation in HLA-B27 and WT limb bud micromasses. Expression of Acan, Col2, Col10, Sox9, Runx2 and Mmp13 measured by quantitative RT-PCR in the HLA-B27 and WT limb bud micromasses. Each number represents an embryo – green samples are HLA-B27-positive; black samples are WT. WT, wild-type.
