Is there any scientific evidence for Chakras?

I have recently begun doing yoga and I am trying to sort through the valid positive physical effects and the more “woo woo” aspects. Have there ever been any scientific research done on Chakras? Have they proven their existence? I’m a little vague.
I am keeping this question in the “general” section, because I don’t want this to turn into a list of magic things that have happened when people opened their chakras. I also don’t want it to turn into an atheist fest, calling all people who believe in something they can’t see as crazy. I don’t know a lot about Chakras. I just want to know if it is a totally spiritual thing, or if they can be backed up scientifically.