Shravan K. Chintala, Ph.D. and Jasti S. Rao, Ph.D.

Department of Neurosurgery, Box 064, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.

Received 9/28/96; Accepted 10/17/96; On-line 11/01/96

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