You won't have much luck searching keywords on your topic with terms like "alternative" or "replacement". Instead, use terms referring to a specific alternative (for example, "organ on a chip"; "in vitro"; "explant"), or terms such as "research design", "sample size", or "minimally invasive". Use the quotations around the terms to find exact phrases.
PubMed comprises more than 22 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
The premier research platform to find and analyze scholarly research literature on Sciences, Social Sciences, Arts, and Humanities. Includes proceedings of international conferences, symposia, seminars, colloquia, workshops, and conventions.
Scopus uniquely combines a comprehensive, curated abstract and citation database with enriched data and linked scholarly content.
Coverage of research in applied psychology, developmental psychology, personality, and more.
From the U.S. Department of Agriculture's National Agricultural Library, this source provides access to journal articles, book chapters, theses, and more on agricultural topics.
