The distribution of discoidin I and discoidin II, developmentally regulated lectins in Dictyostelium discoideum, was determined immunohistochemically at various stages of development. Discoidin I was first prominent as focal clumps in aggregating cells, then accumulated on the surface of aggregates and around them. Discoidin II became prominent later and ultimately localized in what appear to be prespore vesicles. The results indicate that discoidin I and discoidin II have different and possibly multiple functions.
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