BROKER SG Cowen heaped praise on biotech group SkyePharma, which has just taken a strategic stake in a US firm developing what could be a wonder vaccine for the skin disease psoriasis. The potential, if it clears regulatory hurdles, is immense, with 7m patients in the US and 250,000 new cases diagnosed every year. Even without income from the vaccine, the shares are worth 188p against a market price of 55p, the broker claims.