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If you want to make it from scratch
1. Draw some curves with then pen tool (I've only drawn 3 for this demo)
2. Set a soft round brush with shape dynamics and flow set to Fade
3. Stroke the path with the brush
4. Use the ellipse tool to add white circles
5. If you want a glow you could paint it on a new layer or use layer styles as below
Thanks a ton for the super helpful "tutorial" and info. Just what I needed.