Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Far1503/MediaObjects/13075_2004_Article_1384_Fig4_HTML.jpg)
Scatter plot, with linear regression line, showing correlation between BN/GRP and sTNFR1 in serum. Spearman's rank correlation coefficient (rs = 0.61; P < 0.05), measured, using ELISA, in serum from patients with long-standing RA. BN/GRP, bombesin/gastrin-releasing peptide; RA, rheumatoid arthritis; sTNFR1, soluble TNF receptor 1.