The following information accompanied stocks donated to the Bloomington Stock Center by Julian Ng, MRC Centre for Developmental Neurobiology, King's College (7/05).
ssh1-63 is a null allele of ssh generated by imprecise excision of P{PZ}ssh01207. The screen generating this allele was described in Niwa et al., Cell 108(2):233-246, 2002 (FBrf0144752).