abnormal embryo implantation impaired embryo implantation MP:0001729 MPheno.ontology abnormal blastocyst activation abnormal blastocyst competency defective implantation impaired ability of the blastocyst and/or the uterine environment to successfully synchronize allowing attachment of the blastocyst to the epithelial lining of the uterus, its penetration through the epithelium and any subsequent physiological interactions necessary to sustain embryonic development impaired implantation