Repeat allelic type (RAT) frequency of the circumsporozoite central repeats vk210. A) The 23 Latin American (LA) sequences present seven different RATs; three were exclusive. B) The 30 sequences from outside LA (OA) parasites present 17 RATs and 13 were exclusive. RAT I and IV were more frequent in LA than in OA sequences and RAT II and III were more frequent in OA than LA sequences. I. GDRADGQPA; II. GDRAAGQPA; III. GNGAGGQAA; IV. GDRAAGQAA; V. GDGAAGQPA; VI. GNGAGGQPA (see also Additional file 3A).