SAG1* in resting cells is present at the cell periphery, with only small amounts in cilia. Initial ciliary adhesion to minus gametes by SAG1 agglutinin–SAD1** agglutinin interactions triggers gamete activation and redistribution of SAG1 to the peri-ciliary region at the apical ends of the cells followed by ciliary entry. The retrograde IFT motor, cytoplasmic dynein 1b, is required for SAG1 movement along the cytoplasmic microtubules that originate from sites near the bases of the cilia. Although the anterograde motor is not required for ciliary entry of SAG1, it remains unknown whether it transports SAG1 once it is in the cilia. During sustained ciliary adhesion and signaling, SAG1 is released into the medium in the form of ciliary ectosomes and is replaced by protein synthesis. *Although we lack information on whether the SAG1 plus agglutinin fragment and SAG1-C65 form a complex, for simplicity they are here depicted as a single unit (orange stars). **For the purpose of illustrating ciliary adhesion, the model depicts SAD1 [violet stars] on minus gametes interacting with SAG1 on plus gametes and undergoing similar redistribution. Whether SAD1 behaves similarly to SAG1 is unknown, and thus SAD1 behavior in the model is purely speculative.