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Aliso Viejo-based Focal Therapeutics Inc. has raised about $3.8 million in venture capital, according to a Securities and Exchange Commission filing.

Focal makes a tissue-marking device called BioZorb. BioZorb is intended to help surgeons, oncologists and other clinicians clearly identify and delineate in three dimensions a surgical site for tissue removal.

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The device maker’s filing said 28 investors participated in the funding but did not disclose names or plans for use of the proceeds. The filing indicated Focal is seeking about $1.2 million more funding for a total of $5 million in this round.

It raised $3.5 million in Series C money in August 2014 from Okapi Venture Capital in Laguna Beach and Emergent Medical Partners in Portola Valley, according to CrunchBase.