For example you have a cell or already a bunch of cells. Those cell(s) divide and after several week you have a grown organism, for example a human with limbs, several different organs etc. 
However, how do cells know where up, down, left, right etc. is?
I know left and right can be defined clearly in physics. However how do cells define those directions and what are mechanisms for them to grow into a certain direction? 
Is there a paper or a longer article dealing with that question/problem?

I don't think my knowledge on Biology goes far beyond high school level maybe 1. term at a university. If I have to, I would read and learn everything I need to know to understand the matter. 


Question: A BrainF*ck-ish compiler in C
Answer: You need to enlarge tape because your initialization zeroes 101 bytes.  

 section .bss
 tape resb 101


When in graphics mode, the teletype function uses the BL and BH registers as arguments.

 mov  bx,0007h ;Display page 0 and Color 7
 mov  ah, 0Eh
 mov  al, byte [tape +di]
 int  10h


When in text mode, the teletype function uses the BH register as an argument.

 mov  bh,0     ;Display page 0
 mov  ah, 0Eh
 mov  al, byte [tape +di]
 int  10h


You can optimize the setup code by iterating backwards. It shaves off 2 instructions! It too will leave DI=0. 

 mov  di, 101
setup_loop:
 sub di,1
 mov  byte [tape + di], 0
 jnz  setup_loop


I don't know if you would care but the code for [ ] by itself produces an infinite loop if the byte at [tape + di] is anything but zero.