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        Signature
      
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        /s/ David McClung, by power of attorney
      
      
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        Stock symbol
      
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        BCDA
      
      
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        Transactions as of
      
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        Apr 23, 2025
      
      
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        Transactions value $
      
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        $24,999
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        4/28/2025, 06:46 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | BCDA | Common Stock | Purchase | $25K | +13.1K | +417.27% | $1.91 | 16.3K | Apr 23, 2025 | 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 | BCDA | Warrant (right to buy) | Purchase |  | +13.1K |  |  | 13.1K | Apr 23, 2025 | Common Stock | 13.1K | $1.91 | Direct | F1 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  Note: this Form 4 was inadvertently filed a day late due to changes made to filing codes for which the issuer had not been made aware.