Measurement of 1H-19F dipolar couplings in fluorolabeled RNA from X-filtered E.COSY spectra ( 01JB39-20 ) and S3E-COSY experiments ( 01JMR179-152 ) Structure Refinement ( 96ENC4028 ) Isotope labeling of Nucleic Acids Investigation of unusual DNA motifs ( 01METH341 )