Fig. 3

The contents of trace elements in maternal blood, placenta, and umbilical cord blood of the normal and disease groups. (Fig. 3A): Zn, (Fig. 3B): Fe, (Fig. 3C): Cu, (Fig. 3D): Ni, (Fig. 3E): Mn, (Fig. 3F): Cr. (* and ** indicate that there are significant differences among matched samples in the same group, P < 0.05 and P < 0.001; #, ## indicate that there are significant differences among the same samples in different groups, P < 0.05, P < 0.001.)