Your Query returns 41 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
SYN2NM_0805017227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1693337227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1693347227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1693357227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1764517227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1693327227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1693357227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NM_1764517227syn    SYN1    CG3985    Dsyn-1    synapsin   
SYN2NT_0337777227syn    SYN1    CG3985    Dsyn-1    synapsin   
Syn2AF2773897227
SYN2X954547227
Syn2AY0948957227
SYN2AF2811543702
syn2AY2545265141
Syn2NM_013681100902900074L19Rik    600755
Syn2NW_04769610116
Syn2NM_01915910116
SYN2BC0513079606SYNII    SYNIIa    SYNIIb    600755
SYN2AF0776719606600755
SYN2AF0777379606600755
syn2X898519606600755
SYN2NM_0031789606SYNII    SYNIIa    SYNIIb    600755
SYN2NM_1336259606SYNII    SYNIIa    SYNIIb    600755
SYN2L3202610090600755
Syn2NT_03935310090600755
Syn2AH01085710090600755
Syn2AF34586310090600755
Syn2AF34586410090600755
Syn2AF34586510090600755
Syn2AF34586610090600755
SYN2AB1133818030
SYN2AB1203658161
SYN2AB1100178161
SYN2NT_0225179606600755
Syn2AE0038067227
Syn2NM_0790387227CG4905    DmSYN-2   
Syn2NM_1661797227CG4905    DmSYN-2   
Syn2NM_1661807227CG4905    DmSYN-2   
Syn2NM_1661817227CG4905    DmSYN-2   
Syn2NM_1762017227CG4905    DmSYN-2   
Syn2NT_0337787227CG4905    DmSYN-2   

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

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Text2Knowledge ... Yong Huang 2002