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Signaling with HPs in unicellular green algae conjugation: a hypothesis. The mating types in Chlamidomonas rheinardi are defined by two HPs, GSM1 and GSP1. A classical view is that following fusion the two HPs form heterodimers and trans-activate zygotic genes. The proposal is that fusion between the gametes is posterior to HP exchange and takes place only if the two gametes are of opposite signs.
