FIGURE 1:

Fused-fiber nanonets. Scanning electron microscope images of nanonets spun over a hollowed-out scaffold such that large-diameter (∼1000 nm), widely spaced fibers are orthogonal to and overlay small-diameter (250 nm), closely spaced fibers. Both fiber layers are fused at the intersections as shown by the red dashed oval. In such a configuration, cells interact exclusively with suspended fibers.