Figure 4. The PCR products from the egg contents of laying hens fed diets containing control corn (CC) and phytase transgenic corn (PTC) for 16 weeks.

(a) The endogenous gene (396 bp) of poultry for ov (left), (b) The exogenous gene (678 bp) of PTC for phyA2 (right). Arrows indicate the expected length of PCR products. M = marker; lanes 1 = CC-fed laying hens (control); lanes 2 = PTC-fed laying hens; + = positive (GM corn), and − = negative control (no DNA).