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                Beneficial 
                 
            Ownership Prior to this Offering  | 
             |  | 
               
                Maximum 
                 
            Number of Shares to be Sold Pursuant to this Prospectus(2)  | 
             |  | 
               
                Beneficial 
                 
            Ownership After this Offering(1)  | 
             | |||||||||||||||||||||
| 
               
                Name of Selling Stockholder 
               
             | 
             |  | 
               
                Number of
                 
            Shares  | 
             |  | 
               
                Percentage of
                 
            Outstanding Common Stock  | 
             |  | 
               
                Number of
                 
            Shares  | 
             |  | 
               
                Percentage of
                 
            Outstanding Common Stock  | 
             | ||||||||||||||||||
| 
               
                Eventide Healthcare Innovation Fund I LP(3)
               
             | 
             |  |  |  | 1,394,336 |  |  |  |  |  | 9.99% |  |  |  |  |  | 6,681,749 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Cormorant Global Healthcare Master Fund, LP(4)
               
             | 
             |  |  |  | 1,394,336 |  |  |  |  |  | 9.99% |  |  |  |  |  | 4,454,479 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                AI Biotechnology LLC(5)
               
             | 
             |  |  |  | 1,394,336 |  |  |  |  |  | 9.99% |  |  |  |  |  | 8,909,033 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Citadel CEMF Investments Ltd.(6)
               
             | 
             |  |  |  | 1,181,088 |  |  |  |  |  | 8.46% |  |  |  |  |  | 1,181,088 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Soleus Capital Master Fund, L.P.(7)
               
             | 
             |  |  |  | 890,868 |  |  |  |  |  | 6.38% |  |  |  |  |  | 890,868 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Entities affiliated with Baker Bros. Advisors LP(8)
               
             | 
             |  |  |  | 696,470 |  |  |  |  |  | 4.99% |  |  |  |  |  | 6,681,813 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Entities affiliated with Acorn Bioventures(9)
               
             | 
             |  |  |  | 696,470 |  |  |  |  |  | 4.99% |  |  |  |  |  | 3,118,147 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Delaware Street Capital Master Fund, L.P.(10)
               
             | 
             |  |  |  | 696,470 |  |  |  |  |  | 4.99% |  |  |  |  |  | 2,227,244 |  |  |  |  |  | 115,000 |  |  |  |  |  | * |  |  | 
| 
               
                Entities affiliated with Parkman(11)
               
             | 
             |  |  |  | 696,470 |  |  |  |  |  | 4.99% |  |  |  |  |  | 1,781,785 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Entities affiliated with LifeSci Ventures(12)
               
             | 
             |  |  |  | 696,467 |  |  |  |  |  | 4.99% |  |  |  |  |  | 1,336,321 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                AlphaCentric LifeSci Healthcare Fund(13)
               
             | 
             |  |  |  | 668,151 |  |  |  |  |  | 4.79% |  |  |  |  |  | 668,151 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Lytton-Kambara Foundation(14)
               
             | 
             |  |  |  | 455,374 |  |  |  |  |  | 3.26% |  |  |  |  |  | 445,434 |  |  |  |  |  | 9,940 |  |  |  |  |  | * |  |  | 
| 
               
                Micro Cap Partners, L.P.(15)
               
             | 
             |  |  |  | 445,434 |  |  |  |  |  | 3.19% |  |  |  |  |  | 445,434 |  |  |  |  |  | — |  |  |  |  |  | — |  |  | 
| 
               
                Worldwide Healthcare Partners LLC(16)
               
             | 
             |  |  |  | 445,434 |  |  |  |  |  | 3.19% |  |  |  |  |  | 445,434 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |