Table 2. Surface mass density and visco-elastic property of adsorbed rhBMP-2 and BMPRs-recruitment to rhBMP-2 layer on the HAP and Mg-HAP surfaces (n = 5).

	HAP	Mg-HAP
ΔmrhBMP-2(ng/cm2)	63.7 ± 2.5	55.2 ± 1.8
(ΔD/Δf)rhBMP-2(10−8Hz−1)	3.94 ± 0.22	6.73 ± 0.32
ΔmBMPR-IA(ng/cm2)	30.1 ± 1.1	56.6 ± 2.1
ΔmBMPR-IB(ng/cm2)	7.8 ± 0.7	14.2 ± 1.4
ΔmBMPR-II(ng/cm2)	19.8 ± 1.4	18.8 ± 1.1
ΔmActR-I(ng/cm2)	5.7 ± 1.1	5.3 ± 0.9
ΔmActR-II(ng/cm2)	4.7 ± 0.6	4.9 ± 0.8
ΔmActR-IIB(ng/cm2)	6.4 ± 1.3	5.6 ± 1.2