GSTM1 and hydrops fetalis: This paper examines three cases of hydrops fetalis in Indonesian fetuses homozygous for the HBA2:c.179G>A mutation (also known as Hb Adana or the αcodon 59α/αcodon 59α genotype); one mother was a compound heterozygote for the Hb Adana mutation and a “silent” mutation at codon 22 of the α2 gene [α22(B3)Gly→Gly or HBA2:c.69C>T; also known as the αcodon 59α/αcodon 22α genotype] and she manisfested a moderate α-thal.