Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At5g23450	Involved in the production of sphingolipid metabolites.	Phosphorylation of sphingoid long-chain bases in Arabidopsis: functional characterization and expression of the first sphingoid long-chain base Kinase gene in plants.; 2005; DOI: 10.1093/pcp/pci023; PMID: 15695468; https://pubmed.ncbi.nlm.nih.gov/15695468/
Arabidopsis	At4g21540	Involved in the production of sphingolipid metabolites.	Involvement of sphingosine kinase in plant cell signalling.; 2008; DOI: 10.1111/j.1365-313x.2008.03579.x; PMID: 18557834; https://pubmed.ncbi.nlm.nih.gov/18557834/ | Phosphatidic acid binds and stimulates Arabidopsis sphingosine kinases.; 2011; DOI: 10.1074/jbc.m110.190892; PMID: 21330371; https://pubmed.ncbi.nlm.nih.gov/21330371/ | Connections between sphingosine kinase and phospholipase D in the abscisic acid signaling pathway in Arabidopsis.; 2012; DOI: 10.1074/jbc.m111.274274; PMID: 22275366; https://pubmed.ncbi.nlm.nih.gov/22275366/
Arabidopsis	At4g21534	Involved in the production of sphingolipid metabolites.	Phosphatidic acid binds and stimulates Arabidopsis sphingosine kinases.; 2011; DOI: 10.1074/jbc.m110.190892; PMID: 21330371; https://pubmed.ncbi.nlm.nih.gov/21330371/ | Connections between sphingosine kinase and phospholipase D in the abscisic acid signaling pathway in Arabidopsis.; 2012; DOI: 10.1074/jbc.m111.274274; PMID: 22275366; https://pubmed.ncbi.nlm.nih.gov/22275366/