Hi, I have an excel file containing Gene name, Regulation, Breed and Time. I have two breeds that I Have symbolised 1=Pietrain and 2=landrace and I also symbolised 7 time points, 1,2,3,4,5,6,7 for 2,4,8,12,16,24,30 hours that the samples were taken. My problem is that I want to create a table with Time min, Time max for each gene per Breed and I can't think of a way of doing it. I know that range() could be a solution but how can it be applied to each row (each gene) and consider both breed and time range? Any ideas? Cheers, Daphne