1. A polynucleotide comprising a first region having at least 85% sequence identity to SEQ ID NO: 1 or a functional portion thereof comprising the sequence of SEQ ID NO: 3 and/or SEQ ID NO: 4, operably linked to a second region having at least 85% sequence identity to SEQ ID NO: 2 or a functional portion thereof comprising the sequence of SEQ ID NO: 8 and/or SEQ ID NO: 9, wherein the first region is fused directly to the second region or is joined to the second region by a linker comprising one to one hundred nucleotides.
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