crystal structure of human polynucleotide phosphorylase

and background biochemistry biology biomedical cartoon chain chemical chemistry coil coiling color complexity computer digitally dimensional enzyme exoribonuclease gaussian generated graphic healthcare helix homotrimer human illustration image interaction medicine metabolism model molecular molecule mrna object people peptide phosphorylase physiology pnpase polynucleotide processing protein research ribbon science secondary shape sheet strand structure surface tertiary three white