diff --git a/invivos/app.R b/invivos/app.R
index 4585868..c4da854 100755
--- a/invivos/app.R
+++ b/invivos/app.R
@@ -290,7 +290,7 @@ server <- function(input, output) {
     content = function(file){
       ncages<-input$ncages
       nrat_cage<-5
-      id_tumors<-c("L","R")[as.numeric(input$ntumors)]
+      id_tumors<-c("L","R")[1:as.numeric(input$ntumors)]
       # timepoint<-c(7,10,13,16,19,22,25)
       
       if (!is.null(input$file_sizes)){