Following Allergan's (AGN) acquisition of small-cap NASH play Tobira (TBRA), Stifel analyst Stephen Willey notes there are some "interesting" similarities between Conatus (CNAT) and the latter. However, the analyst points out that the clearest distinctions between the two are Conatus' emphasis on some of the downstream consequences of NASH fibrosis and the amount of meaningful clinical data generated to date. Willey still thinks Conatus' emricasan is an interesting asset, but urges investors seeking Tobira-like premiums to exercise a level of caution. He reiterates a Buy rating and $6 price target on Conatus' shares. In afternoon trading, shares of Conatus have gained about 20% to $2.10.