SELP-415K nanofiber growth kinetics measured in 5 mM (circles) and 50 mM (triangles) NaCl concentrations. Growth kinetics was assessed by measurement at various incubation time points (5, 15, 30, 60, 180, 360, and 540 minutes) using 1 μg/ml polymer solution incubated on the mica surface at room temperature for 12 hours for each salt concentration.