Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carbon Nanotubes as Intracellular Protein Transporters: Generality and
  Biological Functionality   Various proteins adsorb spontaneously on the sidewalls of acid-oxidized
single-walled carbon nanotubes. This simple non-specific binding scheme can be
used to afford non-covalent protein-nanotube conjugates. The proteins are found
to be readily transported inside various mammalian cells with nanotubes acting
as the transporter via the endocytosis pathway. Once released from the
endosomes, the internalized protein-nanotube conjugates can enter into the
cytoplasm of cells and perform biological functions, evidenced by apoptosis
induction by transported cytochrome c. Carbon nanotubes represent a new class
of molecular transporters potentially useful for future in-vitro and in-vivo
protein delivery applications.

15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc