Table 5.

Sites of NCBT expression

	NBCe1	NBCe2	NBCn1	NDCBE	NBCn2
Central nervous system	Widespread, neurons and astrocytes	Blood-brain barrier and elsewhere	Widespread, neurons	Widespread, neurons	Widespread, mainly neurons
Sensory organs	Eye	Eye	Ear		Eye, ear
Peripheral nervous system	Trigeminal ganglion	Trigeminal ganglion	Trigeminal ganglion
Respiratory system	Nose and elsewhere	Lung	Trachea and lung	Trachea and lung
Circulatory system	Cardiac myocytes and elsewhere	Heart	Vasculature	Heart	Heart
Musculoskeletal system	Skeletal muscle	Skeletal muscle	Osteoclasts, skeletal muscle	Skeletal muscle	Skeletal muscle
Upper digestive system	Widespread	Stomach	Widespread		Stomach
Lower digestive system	Widespread, abundant in pancreas	Widespread, abundant in liver	Widespread	Widespread	Widespread
Lymphatic system		Spleen and leukocytes	Spleen and macrophages	Widespread	Spleen
Endocrine system	Thyroid and pancreas	Thyroid		Widespread	Pituitary gland
Urinary system	Kidney	Kidney	Bladder and kidney	Kidney	Kidney
Reproductive system	Widespread	Placenta and testes	Widespread	Testes and elsewhere	Testes

A more complete and detailed examination of each NCBT distribution is provided in text. A distribution of NCBT expression based on the origins of corresponding expressed-sequence-tags is provided in Appendix VI.