A total of three genes have been isolated from "Petunia hybrida" that are similar to "AP2": "P. hybrida APETALA2A" ("PhAP2A"), "PhAP2B" and "PhAP2C". "PhAP2A" is, to a large degree, homologous with the "AP2" gene of "Arabidopsis", both in its sequence and in its expression pattern, which suggests that the two genes are orthologs. The proteins "PhAP2B" and "PhAP2C", on the other hand, are slightly different, even though they belong to the family of transcription factors that are similar to "AP2". In addition they are expressed in different ways, although they are very similar in comparison with "PhAP2A". In fact, the mutants for these genes do not show the usual phenotype, that of the null alleles of A genes. A true A-function gene has not been found in Petunia; though a part of the A-function (the inhibition of the C in the outer two whorls) has been largely attributed to miRNA169 (colloquially called BLIND)ref.