Gene Combination Relationship
GET /api/genecombinations/1264/relationships/genes?format=api
{
    "data": [
        {
            "type": "Gene",
            "id": "MEFV"
        },
        {
            "type": "Gene",
            "id": "NLRP12"
        },
        {
            "type": "Gene",
            "id": "NOD2"
        }
    ]
}