passages.id: split_4_test_963_passage
passages.type: progene_text
passages.text: All loci have a similar organization , except for H1.8 that harbors two TcP2beta genes arranged in tandem and separated by a short repetitive sequence , named SIRE ( short interspersed repetitive element ) , which is also found upstream of the first gene of the tandem and downstream of the second .