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The one cage we had to bring up from the animal facility center has a mouse which is dying soon.
I saw it shaking and walking very weakly.
The skin we grafted is bleeding; the tumor is super huge now.
It's a nude mouse, a mutated species for lab research.
A few hours later, I had to go down to the animal room and bring up the other three mice because their tumor size was too big and the staff wouldn't let them stay with other animals anymore.
I looked at them in the cages. My eyes were tearing. What the heck did I do to them?
For my research, I had to grafted cancer cells onto their skin. I have just introduced a big tumor on each of their back.
And, there was me. Holding a ruler measuring the tumor sizes. Writing down numbers and hoping they are significant enough that I would not have to repeat this experience again. Never again!!
My whole day was pretty much ruined after that. The hopeless faces of those mice keep come to my mind. I feel so guilty and cruel.
Tumor is undesirable..not just on human, but also animals.
Can I not doing this again? 
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