THIRD REGULATION. “Herein we illustrate a third and intermediate level of size regulation, manifest as what appears to be competition among growing traits within late-stage larvae immediately prior to pupation. Superficially, at least, the mechanism of trait competition described herein is similar to the process of cell competition and compensatory growth that operates within compartments of individual imaginal discs.”
http://www.pnas.org/content/95/7/3685.full