Your Query returns 13 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Alk1NM_00961210090Acvrlk1    Acvrl1    601284
ALK1BC0207089606HUSI-I    ALP    BLPI    HUSI    WAP4    WFDC4    SLPI    601284
ALK1BC0426379606ALK-1    ACVRLK1    HHT    HHT2    ORW2    SKR3    ACVRL1    601284
ALK1NM_0030649606ALP    BLPI    HUSI    WAP4    WFDC4    HUSI-I    SLPI    601284
ALK1NM_0000209606HHT    HHT2    ORW2    SKR3    ALK-1    ACVRLK1    ACVRL1    601284
Alk1BC01508310090Acvrl1    601284
Alk1BC01429110090Acvrl1    601284
alk1AJ0101391396
ALK1AB0103884952
ALK1AF1039484959CYP52A12   
ALK1Z725434932
ALK1AF3242465059
ALK10N/A

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002