Apolipocrustacein, formerly vitellogenin, is the major egg yolk precursor protein in decapod crustaceans and is homologous to insect apolipophorin II/I and vertebrate apolipoprotein B.

The first group, named the APO family, suggested that apoCr, apoLp-II/I, and apoB formed a monophyletic branch (NJ: 81; ML: 78; BI: 1.00), with two subclusters defined by highly significant internal branches, corresponding to crustacean decapod apoCr and insect apoLp-II/I subfamilies (NJ: 87; ML: 80; BI: 1.00) on one side and to vertebrate apoB subfamily (NJ: 100; ML: 100; BI: 1.00) on the other side.

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