title: Special issue dedicated to the memory of Cyril Ponnamperuma.
mesh_terms: D000596:Amino Acids / Q000138:chemical synthesis / Q000737:chemistry; D005075:Biological Evolution; D002875:Chromosomes / Q000737:chemistry; D019418:Evolution, Chemical; D018559:Exobiology; D005118:Extraterrestrial Environment; D005740:Gases / Q000737:chemistry; D049673:History, 20th Century; D000069497:Origin of Life; D018539:Saturn
chemical_list: D000596:Amino Acids; D005740:Gases