Figure 1.

(A₁–A₃) Histograms of particle size distribution of PLLA microcarriers prepared with different concentrations of PLLA (A₁–A₃: 5%, 10%, 15%; the gelatin concentration was fixed at 0.25% and the stirring speed at 200 rpm); (B₁–B₃) histograms of the particle size distribution of PLLA microcarriers prepared by different concentrations of gelatin (B₁–B₃: 0.25%, 0.5%, 1%; the PLLA concentration was kept constant at 10% and stirring speed at 200 rpm); (C₁–C₃) histograms of particle size distribution of PLLA microcarriers prepared by different stirring speeds (C₁–C₃): 150 rpm, 200 rpm, 300 rpm; the concentration of PLLA and gelation was held unchanged at 10% and 0.25%, respectively); (D₁–D₃) histograms of particle size distribution of PLLA/nHA microcarriers prepared by different concentrations of nHA (D₁–D₃): 0%, 10%, 20%; the concentration of PLLA and gelation was kept unchanged at 10% and 0.25%, and stirring speed at 200 rpm).