BMC Genomics 2009, 10:58 http://www.biomedcentral.com/1471-2164/10/58 TFeigmuproer5al expression patterns of cross-hybridizing soybean probesets Temporal expression patterns of cross-hybridizing soybean probesets. We identified 576 soybean probesets that cross-hybridized to H. glycines probes. These probesets were grouped into nine expression clusters. The average expression pattern of each cluster is represented by a bold line. genes had highly conserved functions like DNA-binding domains, sodium symporters or zinc fingers, others could possibly be involved in parasitic relationships between H. glycines and soybean plants. Interestingly, cross-hybridiz- ing G. max probesets matched ten distinct H. glycines sequences that were derived from esophageal gland cell cDNA libraries, and P. sojae matched two, respectively (Additional files 13, 14). The respective H. glycines genes are of unknown function, such that a putative role in para- sitism is speculative at this point. It is extremely unlikely that the cross-hybridizing probesets are caused by con- taminating soybean or oomycete nucleic acids. For one, Page 10 of 17 (page number not for citation purposes)