Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At5g19530	Required for correct xylem specification through regulation of the lifetime of the xylem elements.	ACAULIS5, an Arabidopsis gene required for stem elongation, encodes a spermine synthase.; 2000; DOI: 10.1093/emboj/19.16.4248; PMID: 10944107; https://pubmed.ncbi.nlm.nih.gov/10944107/ | ACAULIS5 controls Arabidopsis xylem specification through the prevention of premature cell death.; 2008; DOI: 10.1242/dev.019349; PMID: 18599510; https://pubmed.ncbi.nlm.nih.gov/18599510/ | Thermospermine is required for stem elongation in Arabidopsis thaliana.; 2008; DOI: 10.1093/pcp/pcn109; PMID: 18669523; https://pubmed.ncbi.nlm.nih.gov/18669523/