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TEM images (a–d,i–l), SAED pattern (e,g,m,o) and EDX spectra (f,h,n,p) of Au-nanoparticles in Au3+ solutions incubated with incubation medium in which cowpea seedlings were raised (a,b,e,f); seed coat (c,d,g,h); cotyledons (i,j,m,n); and the roots of intact cowpea seedlings (devoid of cotyledons+seed coat) immersed (k,l,o,p).
