. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HEMOCYTE BEHAVIOR IN ASCIDIAN ALLOREJECTION 193. B Figure 7. The rejection type of Symplcximi re/nans that is initiated after fusion of ampullae. (A) View of rejection area under stereomicroscope. Arrowheads indicate fused ampullae of two incompatible colonies and aggregation of hemocytes in their ampullae. (B) Inside of fused blood vessels during rejection reaction. Single arrows indicate fused points of vascular epithelia in the two incompatible colonies. Arrowheads indicate phagocytes engulfing other hemocytes. Double arr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HEMOCYTE BEHAVIOR IN ASCIDIAN ALLOREJECTION 193. B Figure 7. The rejection type of Symplcximi re/nans that is initiated after fusion of ampullae. (A) View of rejection area under stereomicroscope. Arrowheads indicate fused ampullae of two incompatible colonies and aggregation of hemocytes in their ampullae. (B) Inside of fused blood vessels during rejection reaction. Single arrows indicate fused points of vascular epithelia in the two incompatible colonies. Arrowheads indicate phagocytes engulfing other hemocytes. Double arrowheads indicate disintegrating cells, tv, tunic vessels; z, zooid. Bars: A = 500 pm: B = 10 /urn. described by Mukai and Watanabe (1974). In this type of rejection reaction, when two allogeneic colonies came into contact with each other, their tunics fused, but their ampul- lae neither extended into the opposite colony nor fused with each other. Then, within about 12 h of the contact hemo- cytes infiltrated the tunic from the ampullar tips at the contact area (Fig. 6A). Then, at the contact area, the tunic around the infiltrating hemocytes disintegrated (Fig. 6B). In the second type of rejection reaction, which was dis- covered in this work, fusion of blood vessels and exchange of blood occurred between two incompatible colonies as it does in fusion between compatible colonies. Twelve to fourteen hours after the fusion, hemocytes began to aggre- gate in blood vessels, and cell aggregation progressed inside the fused ampullae. Thereafter, the vessels were filled with aggregated hemocytes until finally the blood exchange was interrupted completely, within about 24 to 48 h after vas- cular fusion (Fig. 7A). Histological observations showed phagocytosis and disintegration of cells in this area (Fig. 7B). In addition, hemocytes infiltrated the tunic mainly from the fused ampullae, and these hemocytes and the surround- ing tunic disintegrated. With respect to hemocyte behavior, the
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