[phenixbb] Definition of "Saenger Class"

Hi All, Could somebody direct me to "saenger class" definitions used in base-pair restraints for DNA/RNA. Cheers Jens *+++++++++++++++++++++++++++++++++++++++++++++++++++++++* * * *Jens J. Birktoft e-mail: [email protected] New York University, Dept. Chemistry Phone: 212-749-5057 *