LGALS4 and Fever: We determined whether ectopic expression of Hsp70 genes is sufficient to trigger behavioral fever by expressing Hsp70A (A isoform, in which Hsp70Aa and Hsp70Ab have 100% amino acid identity) and Hsp70B (B isoform, in which Hsp70Ba, Hsp70Bbb, Hsp70Bb, and Hsp70Bc have at least 99.53% amino acid identity) using two ubiquitous GAL4 lines (Actin-GAL4 and Da-GAL4), respectively (Fig. 3B and fig.