51F13;52F8-52F9
bk1 << Cdk5 << bk2 << Khc
This deletion removes a single ribosomal protein-coding gene (though other genes are also removed).
Flies heterozygous for the deletion do not show a Minute bristle phenotype.
The Df(2R)Jp4 chromosome acts as a dominant moderate suppressor of telomeric silencing (assayed using the effect of the chromosome on the eye colour phenotype of flies carrying "P{wvar}KR3-2", a stable "brown-red" variant of the P{3'WP-2,wvar}2Lt insertion).
Heterozygotes show a significant increase in bouton number at the larval neuromuscular junction (assayed at muscles 6/7 in hemisegment A3) compared to wild type.
All limits from polytene analysis (citation unavailable)