Hi, here's my siggenes.table$genes.up snippet. Two class unpaired SAMR analysis. "Row" "Gene ID" "Gene Name" "Score(d)" "Numerator(r)" "Denominator(s+s0)" "Fold Change" "q-value(%)" "1" "25" "RPL15P22" "RPL15P22" "-1.44115338424578" "-18" "12.4899959967968" "1.27368448239355" "0" "2" "47" "CHAF1A" "CHAF1A" "-1.44115338424578" "-18" "12.4899959967968" "1.30356683838951" "0" "3" "48" "PARP2" "PARP2" "-1.44115338424578" "-18" "12.4899959967968" "1.09780831177589" "0" "4" "52" "HMGXB4" "HMGXB4" "-1.44115338424578" "-18" "12.4899959967968" "1.22596090318945" "0" Why do I get one column more in the data block (9) than the header (8)? Looks like the second column (25,47,48,etc) does not make sense. TIA Leo