1447
In addition to loss of digit identity and varying degrees of polydactyly , proximal skeletal elements are severely shortened in Xt ; ld double homozygous limbs .
 GENE: Xt; GENE: ld
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Xt; GENE: ld