TY - RPRT TI - An automated two-dimensional optical force clamp for single molecule studies. AU - Matthew J Lang AU - Charles L Asbury AU - Joshua W Shaevitz AU - Steven M Block PY - 2002 DO - 10.1016/s0006-3495(02)75185-0 UR - https://pubmed.ncbi.nlm.nih.gov/12080136/ ID - 12080136 ER -