Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) CRESPI EJ,Leptin (ob gene) of the South African clawed frog Xenopus laevis,Proceedings of the National Academy of Sciences of the United States of America,,,2006,103,,10092-10097,https://cir.nii.ac.jp/crid/1571980076385921664,