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A California couple has sued Children’s Hospital Los Angeles over a freezer malfunction that resulted in the loss of blood stem cells from 56 child patients, including their son.

The hospital apologized for the problem a year ago with its cryogenic freezer and said the health of no children was put in jeopardy due to the incident. The lawsuit was filed Wednesday on behalf of a boy who suffers from a rare cancer.

The lawsuit says the loss of his cells cut off a “lifeline and a safety net.”

The hospital says it is committed to working toward a positive outcome for all involved.