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| Description: Left: the crystal structure of an ab dimer is shown. The a subunit is on top and has GTP bound. The b subunit has GDP and the anticancer drug paclitaxel bound. Right: A schematic model of a microtubule. The microtubule can be thought of either as a helical array of ab dimers or as 13 parallel rows of ab dimers. These rows are referred to as protofilaments. Picture Stats: Views: 257 Filesize: 390.45kB Height: 487 Width: 684 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34162 |