Row over allowing research on 28-day embryos

Scientists say increasing limit from 14 days will give greater insightinto congenital conditionsScientists will make a controversial call this week to extend the current 14-day limit for carrying out experiments on human embryos to 28 days. The move follows recent breakthroughs that have allowed researchers to double the time embryos can be kept alive in the laboratory.By extending the current research period, major insights into congenital conditions, heart disease and some cancers could be gai