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It is hard to say what the artifacts are, seems too many to be dust particles and the fact that they are streaked diagonally across the image is curious.
Have you cleaned the camera sensor cover and / or the filters at all recently. Definitely seems to be in the camera , filter system . I would be checking every glass surface in the imaging train to satisfy myself that everything is clean.
Re-doing darks and flats when satisfied all the glass is clean will help tell the story. The image itself looks nicely focused and is showing a nice amount of detail. If and when the dark streaks disappear you should end up with a good image. Good Luck.
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