Figure 2
From: Vitamin D deficiency in undifferentiated connective tissue disease
![Figure 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Far2533/MediaObjects/13075_2008_Article_2380_Fig2_HTML.jpg)
Evolution of undifferentiated connective disease to defined connective tissue diseases. MCTD, mixed connective tissue disease; RA, rheumatoid arthritis; SLE, systemic lupus erythematosus; UCTD, undifferentiated connective tissue disease.