= Digit identity frameshift hypothesis
{title2=$C_{\mathrm{II}},C_{\mathrm{III}},C_{\mathrm{IV}}\mapsto D_{\mathrm{I}},D_{\mathrm{II}},D_{\mathrm{III}}$}
The classical avian hypothesis that <anatomical digit> identities I, II and III are expressed at positional condensations II, III and IV. It distinguishes position from developmental identity; evidence for a limited anterior shift does not require invariant identities for every posterior <anatomical digit>.<1,2,3 = 2,3,4: A solution to the problem of the homology of the digits in the avian hand by Günter P. Wagner and Jacques A. Gauthier>[Original hypothesis]{ref}
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