The effect of fetal microwave exposure on anxiety as evaluated by the OFT. The total distance moved by offspring among the study groups was no different (A). However, the frequency and duration of entry into the center zone of the exposed mice was lower than that of the Control and Sham-control mice (B, C), indicating anxiety behavior. Data are means ± SEM, 12 animals per group; *P < 0.05, versus corresponding values in Control and Sham-control groups.