Below is a list of popular cell biology journals. The list is by no means exhaustive, but it will give you an idea of the kinds of journals that are out there.
If you're having a hard time figuring out how the paper you selected fits into the big picture (the broader implications), it may help to do some background research. This page is intended to help you find reliable sources for scientific background information. The majority of the websites included here are published by academic societies, universities, or publishers. That means they contain a lot more subject-specific information than a general website like Wikipedia (and have more street credibility). One thing to keep in mind: these are not peer-reviewed sources!
Check these out and contact me if you have any questions!