Fig. 4
From: A catechol-type lignan and neolignans are specifically present in the seed coat of tung trees
Content of three catechol-type lignans found in the seed coat at the different developmental stages. (1) Isoamericanol A, (2) americanol A, and (3) 3, 3′-bisdemethylpinoresinol. The data represent the mean of four independent measurements (mean ± SE). Stage 1 (immature green): green fruits about 4.5 cm in diameter, 4 months after anthesis. Stage 2 (mature green): green fruits about 6 cm in diameter, 5 months after anthesis. Stage 3 (turning): red-brown fruits about 6 cm in diameter, 5 months after anthesis. Stage 4 (over ripe): brown fruit about 6 cm in diameter, 5 months after anthesis