Cyclic electron transport in photosynthesis is only concerned with production of ATP.

Explanation

### Step-by-Step Solution:

1. **Understanding Cyclic Electron Transport**:
- Cyclic electron transport occurs in Photosystem I (PSI) of the thylakoid membrane. It primarily involves the reaction center known as P700.

2. **Role of P700**:
- P700 absorbs light energy, which excites electrons. These electrons are then transferred through a series of proteins in the electron transport chain.

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