Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| human gene (protein) | mouse ortholog | yeast ortholog | subpathway | genecards entry |
| ccnh ( cyclin h ) | ccnh | ccl1 | both | ccnh |
| cdk7 ( cyclin dependent kinase (cdk) 7) ) | cdk7 | kin28 | both | cdk7 |
| cetn2 (centrin - 2) | cetn2 | unknown | ggr | cetn2 |
| ddb1 ( ddb1 ) | ddb1 | unknown | ggr | ddb1 |
| ddb2 ( ddb2 ) | ddb2 / xpe | unknown | ggr | ddb2 |
| ercc1 ( ercc1 ) | ercc1 | rad10 | both | ercc1 |
| ercc2 ( xpd ) | ercc2 | rad3 | both | ercc2 |
| ercc3 ( xpb ) | ercc3 | rad25 | both | ercc3 |
| ercc4 ( xpf ) | ercc4 | rad1 | both | ercc4 |
| ercc5 ( xpg ) | ercc5 | rad2 | both | ercc5 |
| ercc6 ( csb ) | ercc6 | rad26 | tc - ner | ercc6 |
| ercc8 ( csa ) | ercc8 | rad28 | tc - ner | ercc8 |
| lig1 ( dna ligase i ) | lig1 | cdc9 | both | lig1 |
| mnat1 ( mnat1 ) | mnat1 | tfb3 | both | mnat1 |
| mms19 ( mms19 ) | mms19 | met18 | both | mms19 |
| rad23a ( rad23a ) | rad23a | rad23 | ggr | rad23a |
| rad23b ( rad23b ) | rad23b | rad23 | ggr | rad23b |
| rpa1 ( rpa1 ) | rpa1 | rfa1 | both | rpa1 |
| rpa2 ( rpa2 ) | rpa2 | rfa2 | both | rpa2 |
| tfiih ( transcription factor ii h ) | unknown | unknown | both | no genecards |
| xab2 ( xab2 ) | xab2 | syf1 | tc - ner | xab2 |
| xpa ( xpa ) | xpa | rad14 | both | xpa |
| xpc ( xpc ) | xpc | rad4 | ggr | xpc |
Title:
nucleotide excision repair
Statement:
ddb2 (ddb2) is one of four human gene (protein) with an unknown mouse ortholog
Answer:
refuted