PLAC8 GI:7706158 placenta-specific 8 1 mqaqapvvvv tqpgvgpgpa pqnsnwqtgm cdcfsdcgvc lcgtfcfpcl 50 51 gcqvaadmne cclcgtsvam rtlyrtrygi pgsicddyma tlccphctlc 100 101 qikrdinrrr amrtf