Correction to: Laboratory Investigation (2008) 88, 264–274; doi:10.1038/labinvest.3700747; published online 28 January 2008

Following the publication of this article, the author has made corrections in the legend of Figure 4 and in Tables 1 and 2 as follows:

Table 1 Relationship between age-related osteoarthritic changes and positive β-catenin immunostaining in Hartley guinea pig knee joint articular cartilage
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Table 2 Relationship between severity of joint changes and positive β-catenin staining
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Figure 4 Histological and immunohistochemical analysis of guinea pig knee joints. Longitudinal sections of tibial medial plateau from 4-month-old (a–d), 8-month-old (e–h) and 12-month-old (i–l) Hartley guinea pigs were stained with H&E (a, e, i), safranin-O (b, f, j), and anti-β-catenin antibody (c, d, g, h, k, l). (d, h, l) Enlarged images of the squared area in (c), (g) and (k), respectively. Note that 4-month-old specimens exhibit a healthy articular cartilage structure and are negative for β-catenin chondrocyte staining, whereas 8- and 12-month-old specimens exhibit both strong staining and degeneration changes (fissures and loss of matrix). Bars represent 0.5 mm (a–c; e–g; i–k) and 0.1 mm (d, h, l).

There are the values switched the other way around between negative and positive in Tables 1 and 2.