Gene or accession: CG17884 Release: 2 Missed gene Comments: This is not to correct an error but rather to add mapping information. The map position of the SNAP-25 gene is in the heterochromatic region on the 3L side of the centromere. Df(3L)1-16* removes the gene and we have several mutant alleles of SNAP-25 that fail to complement this deficiency. A more proximal deficiency, Df(3L)8A-80 does not remove SNAP-25. We have an in press manuscript describing the isolation of a SNAP-25 mutation \*Marchant,G.E. and Holm,D.G. (1988) Genetic Analysis of the Heterochromatin of Chromosome 3 in Drosophila melanogaster. I. Products of Compound-Autosome Detachment. Genetics, 120, 503-517. \**Rao, S., Stewart, B.A., Rivlin, P., Vilinsky, I., Watson, B.O., Lang, C., Boulianne, G., Salpeter, M., and Deitcher, D.L.(2001) Two Distinct Effects on Neurotransmission in a Temperature-Sensitive SNAP-25 Mutant, EMBO, in press.