Cell morphology after cultured in alloys extracts for 6 days: a) Mg-1Ca-0.5Sr-2Zn, b) Mg-1Ca-0.5Sr-4Zn, c) Mg-1Ca-0.5Sr-6Zn, d) Mg-1Ca-0.5Sr, e) Ti-6Al-4V and f) cell viability after cultured in alloys extracts for 2, 4, and 6 days. The error bars represent the standard deviations calculated from five independent experiments