A new approach for the study of the chemical composition of bordered pit membranes: 4Pi and confocal laser scanning microscopy. American Journal of Botany, 2013; 100 (9): 1751 DOI: 10.3732/ajb.1300004 ...

Three bordered pits are revealed in this 3-D microscopic cross ... "It helps explain how trees seal off the cells of wood so that softwood trees don't 'bleed to death,' or lose all their sap when ...

image: Three bordered pits are revealed in this 3-D microscopic cross-section of pine wood, with cellulose appearing in green and pectin in red.