part_of part of part of sieve tube element secondary phloem secondary phloem sieve element secondary phloem sieve tube element PO_GIT:439 secondary phloem sieve tube member (exact) 二次師部（師管部） 篩管要素 (Japanese, exact) plant_anatomy elemento de tubo criboso del floema secundario (Spanish, exact) A sieve tube element (PO:0000289) that is part of a portion of secondary phloem (PO:0005043). 2012-03-12T02:41:15Z rwalls secondary phloem sieve-tube element (exact) PO:0025457