Gene correlation networks predicted using weighted genes correlation analysis (WGCNA). Gene networks are associated with a variety of cellular activities including cellular housekeeping, mitosis, tissue heterogeneity, extracellular matrix synthesis as well as numerous others. Gene clusters “paleturquoise”, “darkorange2”, and “darkslateblue” are enriched in known extracellular matrix protein markers in AF, while the clusters “black”, “grey60”, and “lightyellow” are associated with extracellular matrix protein markers characteristic of NP.