Fig. 1. Ultrastructural analysis of a CRK1+CRK2-deficient procyclic-form T. brucei cell. (A) The ultrastructure of an elongated and branched posterior end examined by transmission electron microscopy. Cortical microtubule arrays can be seen in the elongated posterior end shown in the rectangle. The extended and branched mitochondrial structure is marked by asterisks. (B) An enlarged view of cytoskeleton in the rectangle in A, showing a bundle of microtubule corset. Bars, 100 nm (A); 0.5 nm (B).