| http://www.w3.org/ns/prov#value | - The pectoralis minor is a thin, triangular muscle of the upper chest wall; the pectoralis major is a large, fanlike muscle that covers most of the upper, front part of the chest.Affected individuals may have variable associated features, such as underdevelopment or absence of one nipple (including the darkened area around the nipple) and/or patchy absence of hair under the arm.
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