NBME 21

nbme21/Block 4/Question#15

A 5-year-old boy is brought to the physician for a ...

Lack of choroidal pigment deposition in the macula

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submitted by cantaloupe5(5),

Proccess of elimination for this one. Two you can eliminate immediately just from looking at the biochemical pathway chart. The other two required knowledge that eumelanin is more protective than pheomelanin (this is why redheads burn more easily). Because pheomelanin is less protective, there would be more not less ROS from sunlight.