A. Wild type ss locus over deficiency1.
B. transgene4 upregulates expression frequency from the endogenous ss gene in cis.
C. Quantification of A, B, and D
D. transgene4 upregulates expression frequency from the endogenous ss gene in trans.
E. transgene4 upregulates expression, though less efficiently, from the ss locus on the non-homologous 2nd chromosome.
F. Quantification of E.
G. Ss/Rh4 is not expressed in sslow freq1 hemizygous mutants.
H. The normal regulatory regions of the ssprot null1 allele upregulate Ss/Rh4 expression from the sslow freq1 allele.
I. Wild type ss homozygous loci.
J. The regulatory regions of the sslow freq1 allele downregulate Ss/Rh4 expression from the wild type ss allele.
K. Quantification of G–J.