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Nasco Fetal Pig - Size: 4"-7"; Injection: Plain Lab Specimen - LS03783: Phylum Chordata Subphylum Vertebrata Class Mammalia.Cat/Page: 1167 15 Usage Categories: Preserved Materials Fetal Pigs Chordata - Mammalia Dissection and Science About Nasco In 1941, Nasco got its start by filling a need for teaching aids that were not readily available from any other source. To this day, we are proud to carry on that tradition and serve customers throughout the United States and abroad with the products they need, the quality they expect, and unbeatable customer service, all at prices they appreciate.