The cumulative fraction of mature fibers that have reached maximum (■) intensity, (◆) length, and (⬟) number of branch points compared with turbidity (▾) as a function of time. Curves that represent the cumulative fraction of mature fibers in terms of length and branch point formation have similar slopes and reached a plateau before turbidity reached a plateau. Curves that represent the cumulative fraction of mature fibers in terms of intensity have similar slopes with turbidity and reached a plateau at the same time. The software package Origin version 6 was used to do the sigmoid fitting.