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In vertebrates,glycine amidinotransferase (AGAT),guanidinoacetate methyltransferase (GAMT) and creatine transporter (CT1) are three proteins involved in creatine synthesis.To provide insight into the molecular evolution mechanism of creatine metabolism,we have cloned and identified BbAGAT,BbGAMT and BbCT1 homologous genes in amphioxus (Branchiostoma belcheri),whose predicted proteins show high identities with AGAT,GAMT and CT1 proteins in vertebrates.