FIRSTORD (in first??.zip) is a program which attempts to find a "good" order for markers based on the two-point lod scores between them. first11.zip - FIRSTORD, demonstration of method for preliminary ordering of loci based on two- point lod scores, available as DOS executable and C source (220 K) We are just starting the experiment of keeping the most up-to- date programs on a local anonymous ftp site, kindly supported by John Attwood. This is diamond.gene.ucl.ac.uk (128.40.82.1), and my programs will be kept in /pub/packages/dcurtis. If you have a problem with any of them, then try looking here first to see if a new version has come out which fixes your problem. If all else fails the packages can be obtained by post from me on receipt of an appropriate number of 5.25 or 3 inch floppy disks. Please make sure you format them first! Dave Curtis dcurtis@crc.ac.uk Academic Dept Psychiatry, St Mary's Hospital Medical School, Norfolk Place, London W2 1NY, England. But shortly: Institute of Psychiatry, De Crespigny Park, London SE5 8AF, England. (71) 703 5411