Fig. 1From: Reporter gene assays and chromatin-level assays define substantially non-overlapping sets of enhancer sequencesCompeting methods for defining enhancers. Classical definitions of enhancers, based on functional tests such as reporter gene assays (bottom), are in tension with enhancer definitions based on chromatin-level assays (top right). For either type of assay, sequences can be chosen based on a large number of specific or undirected criteria (top left)Back to article page