Examlex
The College Board estimates that students spend an average of $2,250 on textbooks and supplies per year.
Infertile
The inability to conceive a child after regular, unprotected sexual intercourse over a certain period of time, typically a year.
X Chromosome
One of the two sex chromosomes, present in both males (XY) and females (XX), that carries genes responsible for the development of many traits.
Central Nervous System
The complex of nerve tissues that controls the activities of the body, comprising the brain and the spinal cord.
Huntington's Disease
A hereditary neurodegenerative disorder characterized by motor, cognitive, and psychiatric symptoms.
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