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27 words ending with in, 13 letters long

canthaxanthin cephalosporin ceruloplasmin chromoprotein corticotropin cycloparaffin digitoxigenin gonadotrophin hemagglutinin intermountain isoagglutinin lactoglobulin macroglobulin methemoglobin nitroglycerin nitroparaffin nucleoprotein oxyhemoglobin phycoerythrin prostaglandin scleroprotein semiporcelain somatotrophin spectinomycin sporopollenin thyroglobulin transmountain