From Science Daily
U.S. biologists have developed a new method of determining the sequence data for both chromosomes of an organism.

The new statistical method is significant because when researchers announce they have sequenced an organism's genome, they really mean they have created a mosaic of two chromosomes, said University of Southern California computational biologist Lei Li.

"A mosaic means it's not real," Li said.

Graduate student Jong Hyun Kim, Professor Michael Waterman and Li were able to infer a complete sequence of the chromosomes of Ciona intestinalis, a marine invertebrate, from existing sequencing data.

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