Random positions and directions is best: lessons from tissue sampling practices of the stereologist.
Mayhew
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TM
D000818:Animals; D006736:Horses / Q000196:embryology* / Q000254:growth & development*; D007668:Kidney / Q000196:embryology* / Q000254:growth & development*; D008168:Lung / Q000196:embryology* / Q000254:growth & development*; D015983:Selection Bias