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| active galactic nuclei (1) |
| astronomy (1) |
| bl lacertae objects: individual (markarian 501=ver j1653+397) (1) |
| blazar (1) |
| evolution (1) |
| galaxies: active (1) |
| gamma rays: galaxies (1) |
| gamma-ray emission (1) |
| large-area telescope (1) |
| multiwavelength observations (1) |