PLAC8 GI:195222740 placenta-specific 8 1 mqaqapvvvv tqpgvgpgpa pqnsnwqtgm cdcfsdcgvc lcgtfcfpcl 50 51 gcqvaadmne cclcgtsvam rtlyrtrygi pgsicddyma tlccphctlc 100 101 qikrdinrrr amrtf