To find scientific articles, search PubMed
Example searches:
stem cells AND gastrointestinal tract
muscular dystrophy AND genetics
Clixk on the "Send to" link and choose Clipboard as the option to store citations you later want to print, email, or save.
If you get a lot of results, in the Advanced Search, try searching your main term in the Title of the article, rather than just by keyword. This will find only articles with your main term in the title. (Don't try this with all of your search terms as that may narrow down your search results drastically, leaving you with potentially only older articles.)