Your Query returns 18 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
A2mNM_00737610090A1m    MAM    Pzp    103950
A2MAY4954477959
a2MAJ4316887719
A2mNM_17562810090A2mp    103950
A2MM113139606103950
A2MM365019606103950
A2MM639599606103950
A2mNW_04769610116
A2MBC0400719606103950
A2MAF3490329606103950
A2MX687289606103950
A2MX687309606103950
A2MAF3490339606A2M-2    103950
A2MNM_0000149606103950
A2mNT_03935310090103950
A2mNM_01248810116Mam    A2MAC1    AI893533   
A2MNT_0097149606103950
A2MBC0262469606103950

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

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Text2Knowledge ... Yong Huang 2002