Expression profiles of the genes encoding enzymes in phenylpropanoid biosynthesis pathway at 12 dai. The blue arrows point to extensin peroxidases [EC: 220.127.116.11] that participate in lignin biosynthesis. Boxes colored in red represent down-regulated genes encoding that enzyme. Boxes colored in green represent up-regulated genes. Boxes colored in yellow represent multiple genes encode the enzyme and some of those different gene copies are up-regulated, while others are down-regulated.