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MEMPHIS, Tenn. (AP) - Veterinarians at the Memphis Zoo said they are concerned about the pregnancy of giant panda Ya Ya after an ultrasound failed to detect a heartbeat.
Blood tests have shown the hormone progesterone, which indicates a pregnancy, but at a lower level than it should be, said Matt Thompson, curator of mammals.
"The lower hormones are not what we expected, so this might not be a good pregnancy," Thompson said.
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