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Towards an update of the current data available on OB proteins this review discusses ( i ) the specific difficulties for proteomic studies of organelles ; ( ii ) a 2012 census of the proteins found in seed OBs from various crops ; ( iii ) the oleosin composition of OBs and their role in organelle stability ; ( iv ) post translational modification of OB proteins as an emerging field of investigation ; and finally we describe the emerging model of the OB proteome from oilseed crops .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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