nucleosome diagram

telomere chromatid mechanism chemical poster methyl group structural epigenetic factor karyotype segregation chromosomal modification phenotype activation acetylation peptide polypeptide pack mutation laboratory methylation histones nucleolus chemistry enzyme nucleotide microbiology suppress regulation biochemistry macromolecule biotechnology deoxyribonucleic chromosomes dna molecule biological microscopic anatomy scientific h1 h3 h4 h2a h2b tail histone proteins diagram spiral molecular research genome structure chromatin evolution medicine chromosome genetic human vector double helix nucleosome science sequence gene biology model protein education medical infographic nucleus genetics cell