Fig. 4. A in Cytoplasmic UV-R Absorption in an Integumentary Matrix (tunic) of Photosymbiotic Ascidian Colonies

Fig. 4. A, Histological cross-section of the Diplosoma virens colony showing surface tunic (su) and middle layer (md). B and C, UV images of the surface tunic of D. virens (band-pass filter: U340). D and E, a pair of UV images of the surface tunic of D. simile (band-pass filter: U340 for D, U340 + CT330/20 for E). Arrows indicate some cell-like objects absorbing UV-R. Arrowhead in C indicates Prochloron cells. bl, tunic bladder cell; bs, branchial sac; cc, cloacal cavity; st, stomach. Scale bars: 100 µm in A, 50 µm in B-E.