Fig. 5. Backward movement of a fragment halted upon irradiation of the telomere of its partner. (A-B) Selected frames from a recording of a telomere ablation operation. (A) Before the operation. (B) The acentric fragment (arrowhead) moved backwards rapidly and was probably a type 1 fragment (Fig. 3A). (C) After the telomere (arrow) of the fragment's partner was irradiated, the backward movement of the fragment stopped (D). Times are given in minutes and seconds. (E) As anaphase progressed, both partners continued polewards, but the transport properties of the spindle (see text) began to act on the fragment (arrowhead) and moved it away from the equator and into the half-spindle. Bar, 5 µm (E).