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In making Receptos (RCPT) an Alpha-Rich pick on August 13, I certainly had bullish expectations for the company and the stock. I was attracted by the company's S1P1 modulator technology and the prospects of the lead drug RPC1063 in both multiple sclerosis and ulcerative colitis. Combined with an earlier-stage drug for eosinophilic esophagitis (for which there are no pharmaceutical treatments) and a preclinical oral GLP-1 program, I thought it likely that Receptos would see a higher share price as the MS program matured and the probability of partnership or acquisition grew.

I didn't expect the pace or magnitude of the move that was to come. Receptos shot up almost 100% in just two months. While at...

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