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abaxial amount of resin amount of secreted annual ring apex auxins Bannan branches cambial activity cambium conifers connection cortex cortical cotyledonary cotyledons cross-sections duct cavity duct cells duct formation elongated embryo epithelial cells examined exudation factors Fahn formed fusiform ray growth ring Hanes hypocotyl juvenile leaves Kinetin Larix laticifers leucoanthocyanins Mayr mesophyll Miinch Napp-Zinn needle number of ducts number of resin number of vertical outer parenchymatous cells phloem duct Pinaceae Pinus halepensis plants portions primary body primary ducts primary xylem radial ducts radial resin ducts region resin acids resin canals resin droplets resin secretion result root secondary body secondary ducts secondary xylem secreted resin secretory cells secretory material secretory substances seedlings seen sheath cells shoot Sifton south slope species of Pinus spherosomes stained stem Sudan IV tangential terpenes tissue tracheids treatment type of duct vertical ducts vertical resin ducts width wood increment wound