Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A mean-field version of the Nicodemi-Prisco SSB model for X-chromosome
  inactivation   Nicodemi and Prisco recently proposed a model for X-chromosome inactivation
in mammals, explaining this phenomenon in terms of a spontaneous
symmetry-breaking mechanism [{\it Phys. Rev. Lett.} 99 (2007), 108104]. Here we
provide a mean-field version of their model.

23
The categories of this paper are: solv-int
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph