The following information accompanied stocks donated to the 
Bloomington Stock Center by Davie Van Vactor, Harvard Medical School.
P{UAS-sbr.V} expresses wild type sbr (FBgn0003321) under UAS control.
P{UAS-sbr.V}2.8 is a  homozygous viable and fertile, third chromosome insertion.
UPDATE 5 Dec 2017: According to personal correspondence with Kevin Cook at the Bloomington Drosophila Stock Center, this insertion maps to the 3rd chromosome (not the 2nd); the personal communication has been updated to reflect this.