This family consists of several repeats of around 42 residues in length. These repeated sequences are found in multiple copies in Trypanosoma cruzi antigens, Swiss:Q26907 contains 23 copies of this repeat.

1: Structure and expression of two Trypanosoma cruzi genes encoding antigenic proteins bearing repetitive epitopes. Lafaille JJ, Linss J, Krieger MA, Souto-Padron T, de Souza W, Goldenberg S; Mol Biochem Parasitol 1989;35:127-136. PMID:2475776