Table 1.

Comparison of the distribution of PrRP and PrRP2 mRNA among mammals, avians, and teleosts.

	Mammala	Avianb		Teleost
	PrRP	PrRP	PrRP2	PrRP2
Whole brain	+	+	+	+c
Telencephalon	–	+	+	–d, +e
Diencephalon	+	+	+	+d,e
Midbrain	–	+	+	+d,e
Cerebellum	–	+	+	–d
Hindbrain	+	+	+	+d,e
Spinal cord	+	–	–	+d
Pituitary	–	+	+	+c,d, –e
Thyroid gland	+
Heart	–	–	+	–d
Lung	+	+	+
Liver	–	–	+	+c
Spleen	–	–	–	–c
Pancreas	+	–	+
Kidney	+	–	+	–c,d
Gut	+	–	+	+c,d
Adipose tissue	–
Skeletal muscle	–	+	+	–c
Testis	+	+	+
Ovary	–	+	+	+c

^aRat (41).

^bChicken (5).

^cMudskipper (12).

^dSea bream (14).

^eGoldfish (45).

+: Definite expression; –: little or nothing.

Blank columns indicate “not examined.”

Distribution of PrRP has not yet been investigated in teleost.

In rats, PrRP mRNA expression is also observed in thymus, trachea, submandibular gland, adrenal gland, and uterus (see PrRP and PrRP-R).