/wp-content/uploads/2019/01/UCSD_logo-tansparent-300-1-300x81-no-hosted-300x81.png00awp-admin/wp-content/uploads/2019/01/UCSD_logo-tansparent-300-1-300x81-no-hosted-300x81.pngawp-admin2014-07-17 02:58:222018-07-24 17:25:24Zebrafish stem/progenitor factor msi2b exhibits two phases of activity mediated by different splice variants