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Fig. 4. Allometric scaling of phosphofructokinase (PFK) activity in North American bumblebees. Abbreviations: b, B. bimaculatus; i, B. impatiens; v, B. vagans; r, B. rufocinctus; p, B. perplexus; g, B. griseocollis; c, Psithyrus citrinus; a, B. affinis; Mb, body mass.