There are many promising corporations that investors can buy on a dip due to recent market volatility or company-specific issues that predate this year. Take, for instance, CRISPR Therapeutics (CRSP 6.43%) and Viking Therapeutics (VKTX 4.01%), two mid-cap biotech companies that have lagged broader equities over the trailing-12-month period.Even with these poor performances, however, there are solid reasons to consider investing in these stocks, especially at current levels. Read on to find out more. 1. CRIS ...