DNA. association Transcription. Diagram http://www.accessexcellence.org/AB/GG/dna_molecule.html has_part Exon. has_part Intron. has_part Nucleotide. History http://biocrs.biomed.brown.edu/Books/Chapters/Ch%208/DH-Paper.html Stands for Deoxyribo Nucleic Acid      Vr.154, Jan 2009     Readme