Flowering is regulated by successive changes of multimeric complexes of MADS-type transcription factors defining four fields: sepal (AP1, AP2), petal (AP1, PI, AP3, SEP3), stamen (AP3, PI, AG, SEP3), and carpel (AG, SEP2, SEP3). The sequences are from Arabidopsis and some of them use 19-equal tuning in which Arg to Ile encompasses one octave.