USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 1-year-old boy is brought to the emergency department because his mother is concerned that there may be something wrong with her child's eyes. She says that the child does not track her movement and believes that his eyes are getting "cloudy." A pediatric eye examination shows a negative red reflex and mature, nuclear cataracts in the toddler bilaterally. Which of the following enzymes is most likely deficient in this toddler?