passages.id: split_1_test_3462_passage
passages.type: progene_text
passages.text: We also show that spoIIIC ( encoding the carboxy - terminal portion of sigma K ) lies approximately 42 kb downstream of spoIVCB ( encoding the amino - terminal portion ) and that the joining of the truncated coding sequences is a reciprocal recombination event in which intervening DNA is deleted from the chromosome as a circle .