x1 = Ste5
x2 = Ste11
x3 = Ste5Ste11
x4 = Gbg
x5 = Ste5Ste11Gbg
x6 = Fus3
x7 = Ste5Ste11GbgFus3
x8 = Ste5Ste11GbgFus3P
x9 = Fus3PP
x10 = Ste5Ste11GbgP
x11 = Ste11Ubi
x12 = p
x13 = Kss1
x14 = Ste5Ste11GbgKss1
x15 = Ste5Ste11GbgKss1P
x16 = Kss1PP
x17 = Ste11P
x18 = Ste12Kss1
x19 = Ste12
x20 = Ste12P
x21 = s
x22 = PREP
x23 = Ste12TeSte5Kss1
x24 = Ste12TeSte5
x25 = Ste12TeSte5P
x26 = FREP