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. Author manuscript; available in PMC: 2013 Nov 4.
Published in final edited form as: Semin Immunol. 2009 Dec 30;22(1):10.1016/j.smim.2009.12.001. doi: 10.1016/j.smim.2009.12.001

Figure 1.

Figure 1

A. A dorsal view of a Botryllus schlosseri colony as described in the text. Adult individuals (zooids), the asexually developing progeny (buds) and the structures involved in allorecognition (ampullae) are highlighted. B. An allorecognition reaction occurring between three distinct colonies (a, b1 and b2). Colonies b1 and b2 are genetically identical subclones that are undergoing vascular reorganization (black arrow) which will eventually lead to a fusion event. Simultaneously, both colonies b1 and b2 are rejecting colony a, and have developed several points of rejection (red arrows) which prevent blood transfer.