Greetings... The transformation matrices in the ATOM_SITES category for all of the DNA examples have been corrected. Thanks those who pointed out the errors. Regards... John -- **************************************************************************** * John Westbrook Ph: (908) 445-5156 * * Department of Chemistry Fax: (908) 445-5958 * * Rutgers University * * PO Box 939 e-mail: jwest@rutchem.rutgers.edu * * Piscataway, NJ 08855-0939 * ****************************************************************************