Ginkgo Zamia Cycas Podocarpus Sequoia Sciadopitys Pinus Welwitschia Gnetum Vitis Ricinus Nuphar Amborella Ceratopteris Pteridium Adiantum Huperzia Ceratodon Physcomitrella Marchantia Penium Closterium Spirogyra Coleochaete Chaetosphaeridium Nitella Chara Klebsormidium Chlorokybus Mesostigma Volvox Chlamydomonas Scenedesmus Prototheca Chlorella Coccomyxa Botryococcus Ostreococcus Micromonas Pyra...

BACKGROUND Green algae of the family Volvocaceae are a model lineage for studying the molecular evolution of multicellularity and cellular differentiation. The volvocine alga Gonium is intermediate in organizational complexity between its unicellular relative, Chlamydomonas, and its multicellular relatives with differentiated cell types, such as Volvox. Gonium pectorale consists of approximatel...

Volvox carteri f. naganensis takes up arginine via a high affinity, highly specific carrier, whereas carriers for neutral and acidic amino acids cannot be detected (even in nitrogen-starved cultures). Exogenous arginine is accumulated against a steep concentration gradient and is incorporated into protein with high efficiency, but It is not catabolized to any significant extent and will not ser...