By Monica Heger

This article was originally published April 2.

Helicos BioSciences' fourth-quarter 2011 revenues plummeted nearly five-fold to $514,000 from $2.5 million one year ago, the company reported last week in a filing with the US Securities and Exchange Commission.

Helicos also disclosed that a customer sent it a demand letter in March, alleging that its products were deficient and that the company did not provide the necessary maintenance support and customer service.

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