Probable transcription factor (PubMed:18794349). May bind to the promoters of target genes, including micro-RNA genes, in order to repress expression, and acting redundantly with flh-1 and flh-3 (PubMed:18794349). Expressed in the embryo (at protein level) (PubMed:18794349). Expressed in most embryonic cells starting at gastrulation and also in head and tail cells during the larval and adult stages (PubMed:18794349). Knockout causes a nearly wild-type phenotype, but a few young larvae have morphological abnormalities (PubMed:18794349). In a flh-1 mutant background, L1 larvae have severe morphological abnormalities and/or appear necrotic, and 100% die before reaching the L2 larval stage (PubMed:18794349). Embryos exhibit significantly lower expression of lin-14, and overexpression of micro-RNAs, including lin-4, mir-48, mir-241, and mir-34 (PubMed:18794349). In a flh-3 mutant background, embryos exhibit significant overexpression of micro-RNAs, including lin-4, mir-48, mir-230, and mir-65 (PubMed:18794349). RNAi-mediated knockdown has no obvious phenotype, but causes precocious embryonic expression of micro-RNA lin-4, when combined with simultaneous RNAi-mediated knockdown of flh-1 (PubMed:18794349).