The tracheal system of Drosophila melanogaster is one of the best characterized multicellular branched organs. Branchless (BNL), a fibroblast growth factor (FGF) ligand, initiates the branching ...
American Journal of Botany, Vol. 69, No. 4 (Apr., 1982), pp. 638-640 (3 pages) Branching patterns of leader shoots and lower branches were compared in 15 sugar maple trees. The number of first-order ...
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