Dr. Valerie Pence

Cincinnati Zoo
4:00 am
Mon October 15, 2012

Sampling the Cincinnati Zoo's frozen garden

Nearly 1,000 seeds, spores, pollen and tissues are stored in liquid nitrogen...some up to 25 years.
WVXU

The Cincinnati Zoo will begin a massive project later this year. It plans to assess the health of all of its rare plant species stored in liquid nitrogen.

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