After a blistering start to the year, small-cap biotech stocks made a U-turn in the second week of February. Speaking to this point, shares of the optical genome mapping company Bionano Genomics (NASDAQ: BNGO), the next-generation DNA sequencing company Pacific Biosciences of California (NASDAQ: PACB), and the genomics medicine company Sangamo Therapeutics (NASDAQ: SGMO) all tumbled by double digits through the first four days of trading this week, according to data provided by S&P Global Market Intelligence. 

BNGO data by YCharts

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Source Fool.com