part_of part of part of sieve tube element Sieve tube elements have sieve areas that are specialized into those with wide pores in sieve plates and those with narrow pores in lateral sieve areas. Sieve tube elements may have inclined end walls with compound or simple sieve plates. Typical of angiosperms. Differ from sieve cells (PO:0025415), which have less pronounced specialization of sieve areas and no sieve plates. sieve tube member (exact) miembro del tubo criboso (Spanish, exact) PO:0000286 sieve-tube element (exact) PO:0000289 師(篩）管要素 (Japanese, exact) plant_anatomy PO_GIT:439 sieve tube segment (exact) A sieve element (PO:0025406) that is part of a sieve tube (PO:0025416) and has as parts sieve areas aggregated into sieve plates (GO:0097218). sieve element sieve tube