TY - JOUR TI - Direct observation of kinesin stepping by optical trapping interferometry AU - Svoboda, Karel AU - Schmidt, Christoph F AU - Schnapp, Bruce J AU - Block, Steven M T2 - Nature DA - 1993/// PY - 1993 VL - 365 IS - 6448 SP - 721 J2 - Nature SN - 1476-4687 ER -