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Fig. 4. Histological section of a control ramet at blastogenic stage D and its corresponding BHT-treated ramet, 3 days arrested at stage D. (A) A `packed' macrophage (arrow) is seen with ingested inclusions between the control zooid 23 stigmata; (B) BHT-treated ramet, empty macrophages (arrowheads) are located between zooid stigmata; (C) packed macrophages (arrowheads) in the control ramet bud; (D) BHT-treated bud with an empty macrophage (arrowhead); (E) a packed macrophage (arrow) in control zooid blood vessel; (F) BHT-treated zooid blood vessel with empty macrophages (arrowheads). Azan Heidenhains stain. bv, blood vessel; mac, macrophage; pig, pigment cell; sg, stigmata. Scale bars, 1 µm.