Contains a pair of adjacent defective P elements of 0.95 kb and 1.15 kb inserted in head-to-head orientation between -0.589 and -0.582 kb. All sne derivatives tested retain only the 1.15 kb element and all normal-appearing derivatives retain only the 0.95 kb element, thus the symbol sn(+).
Tandem insertion of two small P-elements.
snw contains two P-element insertions, of 1.15kb and 0.95kb, inserted at the same site in inverted orientation, with only the 8bp duplication (in this case of sn sequence) usually found bounding an inserted P-element between them. The insertion is in the region -2.0 to 0.0.
Insertion of a 2 kb P element.