title: Esterase polymorphisms in European and American populations of the periwinckle, Littorina littorea (Gastropoda).
mesh_terms: D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D004950:Esterases / Q000032:analysis*; D005060:Europe; D009656:North America; D010641:Phenotype; D011110:Polymorphism, Genetic; D012908:Snails / Q000201:enzymology*
chemical_list: D004950:Esterases