17 beta-estradiol induces spermatogonial proliferation through mitogen-activated protein kinase (extracellular signal-regulated kinase 1/2) activity in the lizard (Podarcis s. sicula)
Molecular Reproduction and Development (2002) - Comment
pubmed: 11803558  issn: 1040-452x  issn: 1098-2795  doi: 10.1002/mrd.1151 

Paolo Chieffi, Luca Colucci Colucci D'Amato, Fabio Guarino, Gaetano Salvatore, Francesco Angelini