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Item 3 of 40 Question Id: 108033 More A newborn girl is being evaluated in the nursery. She was born at term via spontaneous vaginal delivery. Examination shows fusion of the third and fourth fingers bilaterally with an extra digit present between these 2 fingers. The remainder of the examination is unremarkable. Laboratory work-up confirms a mutation in HOXD13, a gene involved in regulating craniocaudal body patterning during embryonic development. This gene encodes a protein that direct