Words to Describe heterokaryons

How heterokaryons often is described ("________ heterokaryons")

• such
• fibroblast
• single
• interspecific
• mammalian
• balanced
• binucleate
• somatic
• viable
• chick
• rat
• natural
• component
• black
• transient
• artificial
• melanocyte
• intergeneric
• stable
• induced
• sterile
• binuclear
• true
• functional
• prototrophic
• fungal
• individual
• human
• presumptive