Amino Acid Sequence, Animals, Base Sequence, Binding Sites, Brain, Cloning, Molecular, DNA, Complementary, DNA-Binding Proteins, Drosophila, ELAV Proteins, ELAV-Like Protein 2, Helix-Loop-Helix Motifs, Humans, Inhibitor of Differentiation Protein 1, Molecular Sequence Data, Nerve Tissue Proteins, Neurons, Organ Specificity, Polymerase Chain Reaction, Protein Biosynthesis, RNA, Messenger, RNA-Binding Proteins, Rats, Repressor Proteins, Restriction Mapping, Ribonucleoproteins, Sequence Homology, Amino Acid, Transcription Factors, Transcription, Genetic