Table 2.

Expression of Arpp and Carp Protein in Fetus

Developmental weeks	Arpp		Carp
	Heart	Skeletal muscle	Heart	Skeletal muscle
1. 10W	N	+	N	+
2. 11W	−	++	++	++
3. 11W	−	+	+	+
4. 14W	N	++	N	++
5. 14W	N	++	N	++

Immunoreactivities were classified based on the Arpp-positive rate. ++, <50%; +, 5 to 50%; +/−, 0 to 5%; −, unstained.

N, Not identified.