CPA4 (carboxypeptidase A4) was preferentially expressed from the maternal allele in several fetal
tissues, but not in fetal brain (Kayashima
T et al, 2003). Bentley et al showed allelic imbalance in 6 to 7 of nine fetuses, and in three
cases the preferentially expressed allele could be identified as maternal (Bentley
L et al 2003).