This is a family of no apical meristem (NAM) proteins these are plant development proteins. Mutations in NAM result in the failure to develop a shoot apical meristem in petunia embryos [2]. NAM is indicated as having a role in determining positions of meristems and primordial [2]. One member of this family NAP (NAC-like, activated by AP3/PI) is encoded by the target genes of the AP3/PI transcriptional activators and functions in the transition between growth by cell division and cell expansion in stamens and petals [1].

1: A homolog of NO APICAL MERISTEM is an immediate target of the floral homeotic genes APETALA3/PISTILLATA Sablowski RW, Meyerowitz EM; Cell 1998;92:93-103. PMID:9489703

2: The no apical meristem gene of Petunia is required for pattern formation in embryos and flowers and is expressed at meristem and primordia boundaries. Souer E, van Houwelingen A, Kloos D, Mol J, Koes R; Cell 1996;85:159-170. PMID:8612269