"multiple forms in" is correct and usable in written English.
This phrase is used to introduce a list of different forms in which something exists or can be expressed. For example, "There are multiple forms in which creativity can be expressed - painting, crafting, and music."
The multiple forms in which PML exists are the likely explanation of this functional diversity.
Many of these exploits remain in place, sometimes in multiple forms in case one is found and removed.
The results suggest that NAT exists in multiple forms in various tissues of the cockroach and that its functions and regulations can vary among tissues.
Frequency-relation based techniques struggle at the hands of multiple forms in which a word can exist.
The term refers to the culturally meaningful visual content that appears in multiple forms in daily life: print images (in books, textbooks, magazines), TV, Internet, advertising, museums, etcetera.
Valadao's bill has repeatedly passed the House and sits in multiple forms in the Senate.
The Elite EX Series in-wall speakers come in multiple forms including in-wall and angled in-ceiling models.
In that study the combination the single-clade vaccines into multi-clade formulations resulted in multiple forms of in vivo immune interference.
Plasmodium parasites, the etiologic agents of malaria, display a complex life cycle with multiple forms occurring in the vertebrate and invertebrate hosts.
The enzyme occurs in multiple forms that differ in their biochemical properties.
Within the DSM-5 re-experiencing can occur in multiple forms, for example, in addition to flashbacks, as trauma-related nightmares (American Psychiatric Association, 2013).
