Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Paradigm shifts. Part I. Collagen. Confirming and complementing the work
  of Henry Small   The paradigm shift in collagen research during the early 1970s marked by the
discovery of the collagen precursor molecule procollagen was traced using
co-citation analysis and title word frequency determination, confirming
previous work performed by Henry Small.

2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th