At my office, we use sharing photo streams as a vital part of our work. I have those photos accumulating on my personal Photo Stream and am wondering if I delete them off my own personal Photo Stream, how will it effect the Shared Photo Stream with my coworkers once the photos have already been shared? As I said, it's a vital part of our work, so I don't want to do a trial and error and risk losing the photos already shared on our Sharing Streams.