Collagen. a strong forous protein found in connective tissue. bone. and the extracellular matrix, has a structure in whch three helices wind around each other to form a triple helix The following sequence represents pert of the primary structure of collagen: What ammo acid ts represented in the sequence by a question mark? Enter your answer as the three-letter ammo acid abbreviation Proline and hydroxyprohne mako up about 30% of the remaining residues The structure of prohno is shown at right Modify the structure so that it represents hydroxyprohne Modify the structure as needed by removing and or adding atoms or bonds