The 1990s witnessed the parallel forces of globalization and regionalization strongly at work. While seemingly contradictory, they are in fact complementary dimensions of market development. This background paper will focus on the latter, and its special dimension of regionalism; i.e., policy driven regional cooperation. Particular attention will be given to the recent advances and challenges i...

ANN HILLBERG SEITZINGER,a,d KENNETH W. FORSYTHE, JR.,b AND MARY LISA MADELLc aCenters for Epidemiology and Animal Health, Veterinary Services, Animal and Plant Health Inspection Service, U.S. Department of Agriculture, Fort Collins, Colorado 80521, USA bCenters for Epidemiology and Animal Health, Fort Collins, Colorado 80521, USA cTrade Support Team, International Services, Animal and Plant Hea...

The metabolite retinoic acid has been implicated as a key player during anterior-posterior patterning in vertebrate embryos. Recent studies in zebrafish extend this model by demonstrating the influence of retinoic acid on endoderm regionalization.