Gibco Rat Primary Cortical Astrocytes are isolated and cryopreserved from the cortex of Sprague Dawley Rats at day E19 of gestation. A flexible, ready-to-use, and quality alternative to fresh astrocytes, each vial contains 1 million cells per mL, passaged once before cryopreservation. These cells consistently yield a post-thaw viability of >70%.