Our cells' nuclei abound with proteins called transcription factors, which attach themselves to specific groups of nucleotides in a gene's promoter region;
(Our cells' nuclei; abound; with proteins) (proteins; called; transcription factors, which attach themselves to specific groups of nucleotides in a gene's promoter region) (transcription factors; attach; themselves; to specific groups of nucleotides; L:in a gene's promoter region)
Our cells' nuclei proteins transcription factors
abound called attach
with proteins
transcription factors, which attach themselves to specific groups of nucleotides in a gene's promoter region
themselves to specific groups of nucleotides L:in a gene's promoter region