This page depicts an electron micrograph of rRNA transcription in a newt egg cell's nucleolus, highlighting eukaryotes' many identical rRNA genes. It shows DNA with proteins and rRNA fibers, indicatin...This page depicts an electron micrograph of rRNA transcription in a newt egg cell's nucleolus, highlighting eukaryotes' many identical rRNA genes. It shows DNA with proteins and rRNA fibers, indicating simultaneous transcription as RNA lengthens from the gene's start. Areas of inactive DNA lack RNA.