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Muscular pulmonary artery and annexed bronchus (histological section, 40X, Movat Russel pentachrome). GLA (red outline) = great longitudinal axis; ED (green outline) = external diameter; EP (yellow outline) = external perimeter; IP* (blue outline) = internal perimeter; LP (pink outline) = lumen perimeter; TA (within yellow outline) = total area; IA* (within blue outline) = internal area; LA (within pink outline) = lumen area.
