1. The arrows here point to successive stroma lamellae (Zea mesophyll chloroplast). In these chloroplasts they are very crowded, and the stroma compartment consists of thin layers sandwiched between the thylakoids.
2. The vertical arrows alongside the label arrow point to successive granum discs in this unusually large granum. The tips of the arrows are in the disc loculi and the dark intervening layers are the back-to-back membranes of each neighbouring disc. The horizontal arrows just to the right point to the curved edges of a few of the granum discs, backing on to layers of stroma between frets.
3. The arrows point to fret connections between stroma lamellae and granum discs.
4. These arrows point to the curved rims of successive granum discs in the stack. Such rims are not seen in places where the section contains the junction between a stroma lamella and a disc (e.g. at the discs between these arrows). Compare the "special case" - next screen.

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