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*Gilbert, S.F., 2000. '''Developmental Biology'''. 6th ed. Sinauer Associates, Inc, Sunderland MA.
 
*Gilbert, S.F., 2000. '''Developmental Biology'''. 6th ed. Sinauer Associates, Inc, Sunderland MA.
 
*{{citation|initiallast = Sjaastad|initialfirst = O.V|2last = Hove|2first = K|finallast = Sand|finalfirst = O|year = 2004|title = Physiology of Domestic Animals|city = Oslo|pub = Scandinavian Veterinary Press}}
 
*{{citation|initiallast = Sjaastad|initialfirst = O.V|2last = Hove|2first = K|finallast = Sand|finalfirst = O|year = 2004|title = Physiology of Domestic Animals|city = Oslo|pub = Scandinavian Veterinary Press}}
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==Creator==
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[[Rachael Wallace]]