Sentence:  For example , the marked susceptibility of the monkey to respiratory infection might be related to its delicate , long alveolar ducts and short , large bronchioles <WSD>situated</WSD> within a parenchyma entirely lacking in protective supportive tissue barriers such as those found in types 1 , and 3 , . 
Meaning of the word marked with <WSD> tags:  determine or indicate the place, site, or limits of, as if by an instrument or by a survey