Figure 2. AFM image of (001)- planes of FAP. (a) After 24-hour immersion in protein-free CaP-sol, FAP crystal grew about 5 nm above the glass level. Arrows point to nano-precipitates of 15 to 20 nm. (b) After 24-hour immersion in CaP-sol containing 0.4 mg/mL rH174, showing amelogenin nanospheres and crystal growth on FAP of about 5 nm. (c) After 24-hour immersion in CaP-sol containing 1.6 mg/mL rH174, showing crystal growth on FAP of, on average, 220 nm. (d) After 24-hour immersion in CaP-sol containing 1.6 mg/mL rH174, showing surface of layer grown on (001)- plane of FAP. (e) After 24-hour immersion in CaP-sol containing 1.6 mg/mL rH174, showing homogeneity of growth on FAP. (f) After 24-hour immersion in CaP-sol containing 2.0 mg/mL BSA.