NBL1, DAN family BMP antagonist MCSLALQQLI SMDLFWRLFF VCGQEGLRAL EATGMMLRVL VGAVLPAMLL AAPPPINKLA LFPDKSAWCE AKNITQIVGH SGCEAKSIQN RACLGQCFSY SVPNTFPQST ESLVHCDSCM PAQSMWEI