Fig. 2

Morphology of HRD at 7 days: a control group, the well is densely covered with cells; b pure Mg, many fewer cells compared with control; c Mg2Ag, the well is densely covered with cells; d Mg10Gd, many fewer cells compared with control; e WE43, similar in appearance to pure Mg and Mg10Gd with very few cells observed in material’s proximity; f for pure Mg, Mg10Gd and WE43, the cells were found mainly at the well edge (the image shows Mg10Gd’s well edge). Asterisk magnesium disc, arrows products of degradation