LOD score profiles generated by interval mapping analysis of dNDF and expression levels of 14 ESTs in silico mapped among 89 ESTs resulting in eQTL. The black triangles indicate the in silico mapping position for each EST. EST mapping information was extracted from the Maize GDB  and the IDP mapping project , according to map bins . The x axis represents ten linkage groups of the Flint × Flint genetic map arranged end-to-end. The middle line represents LOD score threshold 2.4. The "× " indicates five major QTL clusters for cell wall digestibility on bins 1.03, 3.05/06, 6.06, 8.05, and 9.02 . The dashed rectangle shows some eQTLs co-localizing with one major QTL cluster for cell wall digestibility on bin 3.05.