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    • Figure 1. 

      Working model of HUG1/2-mediated assembly of the MGU. Two immobile sperm cells (SC) are physically connected to a vegetative nucleus (VN), forming the MGU, which is transported as a single unit to the female gametophyte for fertilization. External to the peri-germ cell membrane (PGCM), a dual-layered cage structure comprising an inner microtubule cage and an outer HUG protein cage is required for the assembly of the MGU. Short brown lines indicate the microtubules.