Young pigs average weight 200lb, 6-8 months old, mixed breed and gended; tissue collected on wet ice and frozen at -20°C within 2-6 hours of sacrifice. Average tissue weight: 0.2g Collected from certified collection facilities in the Unites States. Special requirements can be accomodated, such as sex, age, breed and weight. Tissues are available either fresh or fresh frozen using liquid nitrogen (additional charge of $45). For overseas orders, please furnish a certificate of compliance from your customs office.