Three biotech stocks appeared in the Spotlight screen Friday, as their fortunes have revived thanks to acquisitions and promising new drugs. Alkermes (ALKS), The Medicines Co. (MDCO) and Regeneron (REGN) are in the 236-member Medical-Biomedical/Biotech industry group, a longtime leader that was ranked No. 32 out of 197 industries as of Friday's IBD. IBD 50 stock The Medicines Co., a developer of heart and blood-thinning drugs, is well out of