PO:0004543 shoot axis tuber A tuber (PO:0025522) that develops from a branch (PO:0025073). PMID 16298403 NCBI_gi 78191091 Sgt2 SGN_gene 1657 PMID 9076990 sgt1 SGN_gene 1688 PMID 2964386 NCBI_gi 169571 sus4 SGN_gene 1848 PMID 16088399 NCBI_gi 38174782 pmt SGN_gene 1974 PMID 17921341 bel5 SGN_gene 2422 PO:0025048 subterranean tuber epidermis A tuber epidermis that is part of a subterranean tuber. PMID 19779693 an1 SGN_gene 1687