Assertion: periwinkle's alkaloid | /r/HasProperty | vbl
Facets:
Source sentences:
text: The principal alkaloids present in the aerial (nonfloral) parts are VBL (vincaleukoblastine, VLB), VCR (leurocristine, vincaleurocristine), vincarodine, vincoline, leurocolombine, viramidine, vincathicine, vincubine, isositsirikine, vincolidine, lochrovicine, catharanthine, vindoline, leurosine, lochnerine, tetrahydroalstonine, and vindolinine.
text: The high therapeutic value and cost of production of the minute amounts of these bis-indole alkaloids (VBL and VCR) have prompted extensive efforts to increase their levels by cell-tissue culture and mutation induction [