The following information accompanied stocks sent by Todd Laverty, UC Berkeley (3/00). 1. In(2)XE-2776 has breakpoints in 2R centric heterochromatin and 57F (within PTP-ER) , so it should be designated In(2R)XE-2776. 2. The PTP-ERXE-2900 mutation is a deletion of 57F2;58A1 rather than a point mutation in the PTP-ER gene.