ribosome obsolete polysome true The reason for obsoletion is that the term is out of scope for GO. Wikipedia:Polysome GO:0005844 OBSOLETE. A multiribosomal structure representing a linear array of ribosomes held together by messenger RNA. They represent the active complexes in cellular protein synthesis and are able to incorporate amino acids into polypeptides both in vivo and in vitro. cellular_component NIF_Subcellular:sao1038025871 polyribosome