hayflick numbers

[Robert Boyd]

jmsdean at pipeline.com wrote:
: some of you have seen my posts.  i'm just a lay person with a large degree
: of curiosity in cellular ageing.  i'm also just getting started.  i went
: through a lot of Medline abstracts today so i'm learning. 
:  
: my question is:  is the Hayflick number always 50 +/- 10 ? 
:                               or is it different for each type of cell? 
:                                what happens when a cell reaches its
: hayflick number? 
:  
: any replies are much appreciated.   
:  
: luke