1. Gene-Gene and Gene-Environment Interactions Involving HLA-DRB1, PTPN22, and Smoking in Two Subsets of Rheumatoid Arthritis 
Henrik Källberg, Leonid Padyukov, Robert M. Plenge, Johan Rönnelid, Peter K. Gregersen, Annette H.M. van der Helm-van Mil, Rene E.M. Toes, Tom W. Huizinga, Lars Klareskog, Lars Alfredsson 
The American Journal of Human Genetics 
Volume 80, Issue 5, Pages (May 2007)
DOI: /516736
Copyright © 2007 The American Society of Human Genetics Terms and Conditions

2. Figure 1
Histograms on ORs for developing anti-CCP–positive (A) and anti-CCP–negative (B) RA for different combinations of absence or presence of R620W PTPN22, single or double HLA-DRB1 SE alleles, and smoking (based on the EIRA study).
The American Journal of Human Genetics  , DOI: ( /516736)
Copyright © 2007 The American Society of Human Genetics Terms and Conditions