Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hhexNM_2040898364Hex   
hhexNM_1309347955hex   
HhexNM_00824510090Hex    Prh    Prhx    604420
HhexNW_04756510116
HHEXBC0143369606PRH    PRHX    HEX    HMPH    HOX11L-PEN    604420
HHEXBC0151109606PRH    PRHX    HEX    HMPH    HOX11L-PEN    604420
HHEXBC0506389606PRH    PRHX    HEX    HMPH    HOX11L-PEN    604420
HHEXAY4046739606604420
HHEXAY4046749598
HHEXAY40467510090604420
HHEXNM_0027299606HEX    PRH    HMPH    PRHX    HOX11L-PEN    604420
HhexAF13255010090Hex    604420
HhexNT_03968910090604420
HhexBC05798610090Hex    Prh    604420
hhexAF1310707955
HHEXNT_0300599606604420
HhexNM_02438510116Hex   

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

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Text2Knowledge ... Yong Huang 2002