Distribution of mature fibers. The rates of changes as a function of time of fluorescence intensity, longitudinal growth, and branch points. Turbidity (●), fluorescence intensity (■), number of branch points (▴), and fiber length (◆) were calculated for each time point. ↑ shows the gel point measured by eye. Distribution of mature fibers in term of longitudinal growth and branch point formation have a maximum at the same time that corresponds to the gel point measured by eye. The distribution of mature fibers in terms of fluorescence intensity has a maximum after longitudinal growth and branch point formation were completed. The software package Origin version 6 (OriginLab, Northampton, MA) was used to do the Gaussian fitting.