A great team is made up of individuals who work well together by recognising and understanding their own skills and how they all contribute to overall success.
There are a number of very useful pyschometric tools available which can identify role preferences, from specialists to negotiators to implementers and so on.
In addition, core behaviours contribute to being an effective team player including understanding the team's objectives, reliability and flexibility.
Being a good team player isn't always easy. Teams are usually created to solve difficult problems, and they often have tight deadlines and strict budgets. But this can be your chance to shine. Look at teamwork as not only a challenge, but a great opportunity.