[Traditional and molecular biology approaches in the study of regeneration (based on materials from 3 international conferences). The 15th Singer Symposium on Regeneration (London, 20-21 March 1996), the 5th International Conference on the Development and Regeneration of the Extremities (University of York, 24-27 March 1996), the Conference of the British Society for Cell Biology and for Developmental Biology (University of York, 27-30 March 1996)].