A lot of groups have sold their practices to ameripath (quest), app, or to the hospital. I hear those group members talk about partnership but there really is no such thing. There might be making full pay but there is no such thing as becoming a partner. A pathologist whose group was sold to ameripath before she was made a partner said that ameripath ends up keeping over 50% of the revenue and puts pressure on the pathologists to go out and get new customers. After three years she couldn't take it anymore and got a university job.
You may not want to ask right away but definitely find out if the partners own the group or if some other entity does.