set, collection of cute red blood cells, erythrocytes characters with different facial expressions, happy, sad, shining, joyful

angry blood cartoon cell character circle collection crying cute design donate donation element emoji erythrocytes expression face funny happy healthcare hematocyte hematopoietic hemocyte hemoglobin icon illustration joyful laboratory laughing love medical mood oxygen protein red research round sad science set shining sign smiling sunglasses support symbol test vector white