text:  But it's also the quality, the genetic quality to make sure that whenever they're going to be reintroduced, they have really all the genes that they need to survive and to face really any kind of changes in their environment. Over all these years, the National Zoo managed to raise four panda cubs. So that's four fresh sets of genes in the genetic panda pool. I spoke with Michael Brown-Palsgrove, curator of Asia Trail and Giant Pandas at the National Zoo.