Figure 2

(a) Hemolymph flowing in the veins. Scale bar: 200 μm. (b) Cross section of the pst. (c, d) The pst under two fluorescence channels (excitation wavelengths of 423–476 nm and 595–677 nm). Scale bar: 50 μm. (e) Composite image of c and d. Scale bar: 50 μm.