Probes included human CDMP1 cDNA (an ApaI fragment, residue 470– 1155) (Chang et al., 1994 (link)) and mouse α2(XI) collagen cDNA (pRAC2-28) (Tsumaki and Kimura, 1995 (link)). Mouse Ihh (Hh-14.1) and Shh (Hh-16.1) cDNA probes were provided by A. McMahon (Echelard et al., 1993 (link)). Mouse Pax1 cDNA (a HincII-SacI fragment) was obtained from H. Koseki and R. Balling (Deutsch et al., 1988 (link)). Mouse PTHrP cDNA (a AvrII/ SmaI fragment) and PTH/PTHrP receptor cDNA (a Sau3A/PvuII fragment) were obtained from A. Broadus (Mangin et al., 1990 (link)). Mouse α1(X) collagen cDNA (pRK26) was provided by K.S.E. Cheah (Kong et al., 1993 (link)). Mouse type IIA procollagen cDNA (exon 2) was from L.J. Sandell (Metsaranta et al., 1991 (link)).