limbs/digits/tail
• thumb shows irregular growth on forepaw ranging from slight change in architecture to elongation of thumb by almost 100%
• when thumb is elongated to certain extent, digit 2 becomes bent and connected to thumb via soft tissue
• thumb phenotype is obvious at day 14 of development
• about 10% of forelimbs examined display an additional phalanx on digit 2
• bone fusion of thumb and digit 2 is never observed
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