Eutectics Electronics has modified their Neuron Tracing System software for working with capillaries. It requires their hardware and a motorized stage. It will run on any PC. Functionality is similar to a digital camera lucida, but it will return measurements as well as give 3-D visualization and plots. It was designzed to merge traces across several sections into single images. I've used their system for tracing neurons. Eutectics Electronics 8608 Jersey Court Raleigh, NC 27613 (919) 782-3000 9113 fax Glen MacDonald Hearing Development Laboratories RL-30 University of Washington Seattle, WA 98195 (206)543-8360 [log in to unmask]