The figure below shows how differential centrifugation can be used to isolate four subcellular fractions. Which fraction corresponds to the mitochondrial fraction? 
Definitions:
Basic-skills-and-phonetics
Fundamental abilities combined with the study of sounds of human speech used in teaching reading and pronunciation.
ABC Approach
A method used to manage priorities or behaviors, typically identifying Antecedents, Behaviors, and Consequences.
Middle Childhood
A developmental stage ranging from about six to twelve years old, characterized by significant growth in social, cognitive, and physical areas.
Late Childhood
A developmental stage occurring approximately between the ages of 6 and 12, characterized by significant growth in cognitive and social abilities.
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