Classes Types Examples
DNA
Methods
(1) Viral delivery systems: * Adenoviral transduction
* Retroviral transduction
* Lentiviral transduction
(2) Non-viral systems: ** Episomal plasmids;Plasmid and episomal vectors
(3) Conditional systemsand
transposons:
* Cre -IoxP recombination
* Piggyback transposon
Non-DNA
Methods
(a) Protein - mediated: * Direct delivery of programmingproteins onto the cell
* Wnt 3a conditioned medium
(b) Manipulation of cellculture condition: - Lower amount of oxygen
(c) Use of histonedeacetylase inhibitors: ** Valproic acid enhancesprogramming  of iPSCs
(d) Sindae virus transduction  
(e) Direct fusion withembryonic  stem cell;cell fusion  
(f) Extraction of embryonicstem cell; cell extract  
Table 4: Methods used in induction and programming of iPSCs.