Phenotype of genes encoding components of protein complexes as a function of copy number is context dependent. A. Cytosolic ribosomal proteins have positive slope in turbidostats B-C. The range of significant FCC's for cytosolic ribosomal proteins. D. Sign of slope of the phenotype-copy number curve for genes specifying proteasome subunits. E-F. Range of significant FCC's for proteasomal proteins.