ESR1 and rheumatoid arthritis: The correlations between GWI and RA occur along the Netpath (1.1.2015) [24] Tumor Necrosis Factor (TNF) alpha pathway (R2 = 0.55), the PID (2014_02_14) [33] annotated Validated Nuclear Estrogen Receptor Alpha Network (R2 = 0.63), and ATF-2 Transcription Factor Network (R2 = 0.54) pathways.