A protein is made up of a chain of amino acids.
The end feel is a physical therapy term to the passive end ROM of a joint. Limited movement is cause by articular surface, ligament extensibility. The factor responsible for limitation of motion will cause a feel and this is then can help therapist diagnose the problem in one's joint.
It could be either sub or hypo.
Throw out the gloves. We do this where I work every day.
C. Billing data! Hope this helps you