PRONEPHROS
\pɹˈə͡ʊnfɹə͡ʊz], \pɹˈəʊnfɹəʊz], \p_ɹ_ˈəʊ_n_f_ɹ_əʊ_z]\
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The head-kidney of embryonic life, arising from mesomeric somites, functional for a time in lower vertebrates, later replaced by mesoor meta-nephros.
By Henderson, I. F.; Henderson, W. D.
