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.
For pregnancy to occur, an egg must be fertilized by a sperm. When fertilization happens inside the body, it is called in vivo fertilization. When fertilization happens outside of the body, it is called in vitro fertilization, or IVF.IVF can help treat infertility in patients who have damaged fallopian tubes, male factor infertility, endometriosis, or unexplained infertility.hen fertilization happens inside the body, it is called in vivo fertilization. When fertilization happens outside of the body, it is called in vitro fertilization, or IVF. IVF can help treat infertility in patients who have damaged fallopian tubes, male factor infertility, endometriosis, or unexplained infertility.