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Line 1: − Spiral strands of [[protein]] [[molecules]] that form a rope-like structure.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia+
sentence structure...
Microtubules are spiral strands of [[protein]] [[molecules]] that form a rope-like structure.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia
Educational Ministries, Inc. 1998</ref>
Educational Ministries, Inc. 1998</ref>