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In general, variables, unknown quantities, and constants (eg, x, y, z, A, B, C) are set in italics, while units of measure (eg, kg, mL, s, m), symbols (including Greek characters [see , Greek Letters]), and numbers are set roman. Also, subscripts or superscripts used as modifiers are set roman: Cin = clearance of inulin. Arrays (A) and vectors (V) should be set boldface. Mathematical functions, such as sin, cos, ln, and log, are set roman.V = oai+bj+ckA=[a11a12a13a21a22a23a31a32a33] For equations that are set off from the text, the words and letters should be set roman and the equation should be capitalized by Less