It isn't illegal to chew gum, but it is illegal to bring them into Singapore or sell them except for medical purposes. Since you can't buy gum (selling is illegal) there's no way to chew them so it's almost as good as not being able to chew gum. See this: http://www.customs.gov.sg/leftNa...
Definition: In Vitro. A study done in vitro, in contrast, looks at how a drug or procedure responds in the confines of a test tube or laboratory dish. Clinical trials or medical studies may be performed either in vivo or in vitro.
Edwards for the development of human in vitro fertilization (IVF), a medical. advance that represents a paradigm shift in the treatment of many types of. infertility. The inability to conceive a child is a reproductive defect that afflicts. more than 10% of all couples worldwide.