has material basis in germline mutation in BHLHA9 mesoaxial synostotic syndactyly with phalangeal reduction https://github.com/monarch-initiative/mondo/issues/4948 https://www.malacards.org/card/syndactyly_mesoaxial_synostotic_with_phalangeal_reduction Mesoaxial synostotic syndactyly (MSSD) with phalangeal reduction is a novel and distinct form of non-syndromic syndactyly including complete syndactyly of the 3rd and 4th fingers with synostoses of the corresponding metacarpals and associated single phalanges, syndactyly of the 2nd and 3rd toes and 5th finger clinodactyly. MEDGEN:324459 SCTID:724170007 UMLS:C1836206 syndactyly mesoaxial synostotic with phalangeal reduction OMIM:609432 GARD:0010590 syndactyly Malik-Percin type syndactyly type 9 syndactyly, Malik-Percin type MSSD Orphanet:157801 syndactyly, mesoaxial synostotic, with phalangeal reduction MESH:C563721 MONDO:0012271 non-syndromic syndactyly polydactyly-syndactyly-triphalangism