Before revision:  The theory is used to calculate the changes in R_g on N, the number of residues for a set of Intrinsically Disordered Proteins (IDPs).
After revision:  Simulations of PA chains, using a charged bead-spring model, further corroborates our theoretical predictions. The simulations unambiguously show that conformational heterogeneity manifests itself among sequences that have identical PA parameters. A clear implication is that the phases of PA sequences, and by inference IDPs, cannot be determined using only the bare PA parameters (\sigma and \delta \sigma). The theory is used to calculate the changes in R_g on N, the number of residues for a set of Intrinsically Disordered Proteins (IDPs).