Assertion: amaranth's level | /r/HasProperty | et al.
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Source sentences:
text: Plant tissue cultures of amaranth have been established (Ellis, 1973; Floresand Galston, 1980; Teutonico and Knorr, 1984a; b; c); these will provide in-vitro methods for crop improvement at the cellular level (Flores et al., 1982).