Antibody:	Anti-cleaved Caspase 3
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS27: lower respiratory tract	Present	Single cells	6F	Very few cells were immunostained in the upper airways.

Structure	Level	Pattern	Image	Note
TS27: lung	Present	Regionally restricted	6G	Apoptotic cells were frequently found in the mesenchyme.
TS27: lower respiratory tract	Present	Regionally restricted	6G	Apoptotic cells were found in the airway epithelium.

Structure	Level	Pattern	Image	Note
TS27: lung vascular element	Present	Single cells	6H	Very few cells were immunostained in the blood vessels.

Structure	Level	Pattern	Image	Note
TS27: lung vascular element	Present	Regionally restricted	6I	Apoptotic cells were frequently found in the blood vessels.

Structure	Level	Pattern	Image	Note
TS27: alveolar system	Present	Single cells	6J	Very few cells were immunostained in the alveoli.

Structure	Level	Pattern	Image	Note
TS27: alveolar septum	Present	Regionally restricted	6K	Apoptotic cells were frequently found in the alveolar septa.