I had plated my cells on 3rd July, and checked them yesterday on 5th July. usually after two days I can see confluent enough growth, around 60% since I plate them 4:10 ratio. But yesterday, the islands of cells were small and surrounded by black debris? around it, and small cell like structures. Their live percentage when I last split was also low, around 30% but it was 3.5 million cells/ml. Is there any way to make them healthy again??

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