Progression of lignin deposition in developing peach fruit. Sectioned fruit were stained with phloroglucinol-HCl for lignin (red colour). Numbers indicate days after bloom (DAB) (A) Fruit series cut perpendicular to the fruit suture. (B) Whole fruit serially cut parallel to the suture at 45 and 51 DAB. The crosses indicate the orientation of the blossom end, the stem end and the suture.