- 
        Signature
      
 
      - 
        /s/ Christian Vasquez
      
 
    
    
      
- 
        Stock symbol
      
 
      - 
        BCAB
      
 
    
    
      
- 
        Transactions as of
      
 
      - 
        Feb 9, 2023
      
 
    
    
      
- 
        Transactions value $
      
 
      - 
        -$682
      
 
    
    
      
- 
        Form type
      
 
      - 
        4
      
 
    
    
      
- 
        Date filed
      
 
      - 
        3/1/2023, 05:31 PM
      
 
    
    
    
    
   
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | 
          Sym | 
          Class | 
          Transaction | 
          Value $ | 
          Shares | 
          Change % | 
          * Price $ | 
          Shares After | 
          Date | 
          Ownership | 
          Footnotes | 
        
      
      
          
            | transaction | 
            BCAB | 
            Common Stock | 
            Tax liability | 
            -$682 | 
            -229 | 
            -0.28% | 
            $2.98 | 
            82.7K | 
            Feb 28, 2023 | 
            Direct | 
            F1 | 
          
      
    
   
  
    Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)
  
  
    
      
        
          | Type | 
          Sym | 
          Class | 
          Transaction | 
          Value $ | 
          Shares | 
          Change % | 
          * Price $ | 
          Shares After | 
          Date | 
          Underlying Class | 
          Amount | 
          Exercise Price | 
          Ownership | 
          Footnotes | 
        
      
      
          
            | transaction | 
            BCAB | 
            Employee Stock Option (right to buy) | 
            Award | 
            $0 | 
            +135K | 
             | 
            $0.00 | 
            135K | 
            Feb 9, 2023 | 
            Common Stock | 
            135K | 
            $3.95 | 
            Direct | 
            F2 | 
          
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  Vice President of Finance, Corporate Controller and Secretary