fused forelimb digits fused forelimb digits part of regenerating forelimb abnormal fusion of forelimb digit in regenerating forelimb and forelimb digit in regenerating forelimb Any abnormal fusion of the forelimb digit in the regenerating forelimb and the forelimb digit in the regenerating forelimb. abnormal forelimb digit morphology in the regenerating forelimb