20. Development
Animal Development
Multiple Choice
Multiple ChoiceThe digits of a developing vertebrate limb respond to molecules that establish an anterior-posterior axis. These molecules originate in __________.
A
a specialized cluster of cells called Sonic hedgehog
B
the apical epidermal ridge (AER)
C
Spemann's organizer
D
the gray crescent
E
the zone of polarizing activity (ZPA)
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